Bootstraps a flutter project with Fastlane and Github Action to deploy on release

bootstrap_flutter_project_with_fastlane.dart

// ignore_for_file: avoid_print

import 'dart:io';

void main() {
  // Read the PRODUCT_BUNDLE_IDENTIFIER from ios/Runner.xcodeproj/project.pbxproj
  // or fallback to com.example.app
  String? appBundleId = 'com.example.app';
  File iosProjectFile = File('ios/Runner.xcodeproj/project.pbxproj');

  if (iosProjectFile.existsSync()) {
    String content = iosProjectFile.readAsStringSync();
    RegExp regExp = RegExp(r'PRODUCT_BUNDLE_IDENTIFIER = (.+);');
    Match? match = regExp.firstMatch(content);
    if (match != null) {
      appBundleId = match.group(1);
    }
  }

  // read applicationId = "com.hejtech.flutter_fastlane_tutorial" from android/app/build.gradle
  // or fallback to com.example.app
  String? appPackage = 'com.example.app';
  File androidBuildFile = File('android/app/build.gradle');

  if (androidBuildFile.existsSync()) {
    String content = androidBuildFile.readAsStringSync();
    RegExp regExp = RegExp(r'applicationId = "(.+)"');
    Match? match = regExp.firstMatch(content);
    if (match != null) {
      appPackage = match.group(1);
    }
  }

  Map<String, String> files = {
    'android/fastlane/.env': '''
# This file should be added to your .gitignore file
# It contains sensitive information that should not be versioned
# https://docs.fastlane.tools/best-practices/keys/#where-do-i-store-my-keys
FIREBASE_APP_ID=
APP_PACKAGE_NAME=$appPackage
# Optional: Override the path to your Firebase service account JSON file (defaults to root of your project)
# GOOGLE_SERVICE_ACCOUNT_JSON_PATH=
''',
    'android/fastlane/Appfile': '''
package_name(ENV["APP_PACKAGE_NAME"]) # e.g. com.krausefx.app
''',
    'android/fastlane/Fastfile': '''
import "../../Fastfile"

default_platform(:android)

platform :android do

  # Build flutter Android app
  lane :build do |options|
    verify_env(envs: [
      "APP_PACKAGE_NAME"
    ])

    # Verify 'firebase_app_distribution_service_account.json' file exists
    unless File.exist?(google_service_account_json_path)
      UI.user_error!("google_service_account.json file not found. Please add it to the root of the flutter project. See https://docs.fastlane.tools/actions/supply/")
    end

    # Verify version number is correct
    if !is_ci && (!options[:version_number])
      version_number = get_version_from_pubspec()
      continue = UI.confirm("Deploying version #{version_number} (from pubspec.yaml) to Play Store. Continue?")

      unless continue
        UI.user_error!("Aborted")
      end
    end

    build_flutter_app(
      type: options[:type] || "appbundle",
      no_codesign: options[:no_codesign],
      config_only: options[:config_only],
      build_number: options[:build_number],
      version_number: options[:version_number],
      store: "playstore"
    )
  end

  # Release to Play Store using Fastlane Supply (https://docs.fastlane.tools/actions/supply/)
  desc "Release to Play Store"
  lane :release_play_store do |options|
    begin
      build(
        no_codesign: options[:no_codesign],
        config_only: options[:config_only],
        build_number: options[:build_number],
        version_number: options[:version_number]
      )

      supply(
        track: 'internal',
        # Uncomment this if getting error "Only releases with status draft may be created on draft app."
        # release_status: 'draft',
        aab: "../build/app/outputs/bundle/release/app-release.aab",
        json_key: google_service_account_json_path,
        skip_upload_apk: true, # Upload the aab instead of apk
        skip_upload_metadata: true,
        skip_upload_changelogs: true,
        skip_upload_images: true,
        skip_upload_screenshots: true
      )
    end
  end

  # Release to Play Store using Firebase App Distribution (https://docs.fastlane.tools/actions/firebase_app_distribution/)
  desc "Release to Play Store using Firebase App Distribution"
  lane :release_play_store_using_firebase do |options|
    begin
      build(
        type: 'apk',
        no_codesign: options[:no_codesign],
        config_only: options[:config_only],
        build_number: options[:build_number],
        version_number: options[:version_number]
      )

      firebase_app_distribution(
        app: ENV["FIREBASE_APP_ID"],
        android_artifact_path: "#{root_path}/build/app/outputs/flutter-apk/app-release.apk",
        service_credentials_file: google_service_account_json_path,
        # Use the following to enable debug mode
        debug: true
      )
    end
  end
end''',
    'android/fastlane/Pluginfile': '''
# Autogenerated by fastlane
#
# Ensure this file is checked in to source control!

gem 'fastlane-plugin-firebase_app_distribution'
gem 'fastlane-plugin-get_new_build_number'
''',
    'android/Gemfile': '''
source "https://rubygems.org"

gem "fastlane"
# takes version from flutter (pubspec.yaml)
gem "fastlane-plugin-flutter_version", git: "https://github.com/tianhaoz95/fastlane-plugin-flutter-version"

plugins_path = File.join(File.dirname(__FILE__), 'fastlane', 'Pluginfile')
eval_gemfile(plugins_path) if File.exist?(plugins_path)
''',

    /// IOS
    'ios/fastlane/.env': '''
ASC_KEY_ID=""
ASC_ISSUER_ID=""
ASC_KEY_P8_BASE64=""
MATCH_PASSWORD=""
MATCH_GIT_BASIC_AUTHORIZATION=""
APP_BUNDLE_ID=$appBundleId
FIREBASE_APP_ID=
# Optional: Override the path to your Firebase service account JSON file (defaults to root of your project)
# GOOGLE_SERVICE_ACCOUNT_JSON_PATH=
''',
    'ios/fastlane/Appfile': '''
app_identifier(ENV["DEVELOPER_APP_IDENTIFIER"])
apple_id(ENV["FASTLANE_APPLE_ID"])

itc_team_id(ENV["APP_STORE_CONNECT_TEAM_ID"])
team_id(ENV["DEVELOPER_PORTAL_TEAM_ID"])
''',
    'ios/fastlane/Fastfile': '''
import "../../Fastfile"

default_platform(:ios)


platform :ios do
  # Authenticate with Apple Store
  private_lane :authenticate_apple_store do
    app_store_connect_api_key(
      key_id: ENV["ASC_KEY_ID"],
      issuer_id: ENV["ASC_ISSUER_ID"],
      key_content: ENV["ASC_KEY_P8_BASE64"],
      is_key_content_base64: true,
      in_house: false
    )
  end

  # Build iOS app
  lane :build_ipa do |options|
    authenticate_apple_store
    
    build_flutter_app(
      type: "ipa",
      no_codesign: options[:no_codesign] || false,
      config_only: options[:config_only] || false,
      build_number: options[:build_number] || get_build_number('appstore'),
      version_number: options[:version_number] || get_version_from_pubspec(),
      store: "appstore"
    )
  end


  desc "Release a new build to Apple Store"
  lane :release_app_store do |options|
    verify_env(envs: [
      "ASC_KEY_ID",
      "ASC_ISSUER_ID",
      "ASC_KEY_P8_BASE64",
      "APP_BUNDLE_ID",
      "MATCH_PASSWORD",
      "MATCH_GIT_BASIC_AUTHORIZATION",
    ])

    authenticate_apple_store

    build_number = options.fetch(:build_number, get_build_number('appstore'))
    version_number = options.fetch(:version_number, get_version_from_pubspec())

    # Verify version number is correct
    if !is_ci && (!options[:version_number])
      continue = UI.confirm("Deploying version #{version_number} (from pubspec.yaml) to App Store. Continue?")

      unless continue
        UI.user_error!("Aborted")
      end
    end

    # Sync certificates and profiles using match
    UI.message("Syncing certificates and profiles")
    
    if is_ci
      UI.message("CI detected. Setting up CI environment")
      setup_ci
    end

    sync_code_signing(
      type: "appstore",
      readonly: is_ci,
    )

    build_ipa(
      build_number: build_number,
      version_number: version_number
    )

    build_app(
      skip_build_archive: true,
      archive_path: "../build/ios/archive/Runner.xcarchive",
    )

    # If GoogleService-Info.plist exists and Pods/FirebaseCrashlytics exists
    # Upload symbols to Firebase Crashlytics
    if File.file?("../ios/Runner/GoogleService-Info.plist") && File.directory?("../ios/Pods/FirebaseCrashlytics")
      upload_symbols_to_crashlytics(
        gsp_path: "../ios/Runner/GoogleService-Info.plist"
      )
    end

    upload_to_testflight(
      skip_waiting_for_build_processing: true
    )
  end
  
  # This is a work in progress, requiring ad-hoc export method
  # desc "Release to Play Store using Firebase App Distribution"
  # lane :release_to_firebase do |options|
  #   begin
  #     build_ipa

  #     firebase_app_distribution(
  #       app: ENV["FIREBASE_APP_ID"],
  #       service_credentials_file: google_service_account_json_path,
  #       ipa_path: "../build/ios/Runner.ipa"
  #     )
  #   end
  # end
end
''',
    'ios/fastlane/Matchfile': '''
git_url("https://github.com/your/app-certificates-and-profiles.git")
storage_mode("git")
type("appstore") # The default type, can be: appstore, adhoc, enterprise or development

app_identifier([ENV["APP_BUNDLE_ID"]])
''',

    'ios/fastlane/Pluginfile': '''
# Autogenerated by fastlane
#
# Ensure this file is checked in to source control!

gem 'fastlane-plugin-firebase_app_distribution'
gem 'fastlane-plugin-get_new_build_number'
''',
    'ios/Gemfile': '''
source "https://rubygems.org"

gem "fastlane"
# takes version from flutter (pubspec.yaml)
gem "fastlane-plugin-flutter_version", git: "https://github.com/tianhaoz95/fastlane-plugin-flutter-version"

plugins_path = File.join(File.dirname(__FILE__), 'fastlane', 'Pluginfile')
eval_gemfile(plugins_path) if File.exist?(plugins_path)
''',

    /// Generics
    'Fastfile': '''
opt_out_usage

# Have an easy way to get the root of the project
def root_path
  Dir.pwd.sub(/.*\\Kfastlane/, '').sub(/.*\\Kandroid/, '').sub(/.*\\Kios/, '').sub(/.*\\K\\/\\//, '')
end

# Have an easy way to run flutter tasks on the root of the project
lane :sh_on_root do |options|
  command = options[:command]
  sh("cd #{root_path} && #{command}")
end

# Tasks to be reused on each platform flow
lane :fetch_dependencies do
  sh_on_root(command: "flutter pub get --suppress-analytics")
end

# Tasks to be reused on each platform flow
lane :build_autogenerated_code do
  sh_on_root(command: "flutter pub run build_runner build --delete-conflicting-outputs")
end

# Tasks to be reused on each platform flow
lane :lint do
  sh_on_root(command: "flutter format --suppress-analytics --set-exit-if-changed -n lib/main.dart lib/src/ test/")
end

lane :build_flutter_app do |options|
  pubspec_version_number = get_version_from_pubspec()

  type = options[:type]
  build_number = options[:build_number] || get_build_number(options[:store])
  version_number = options[:version_number] || pubspec_version_number
  no_codesign = options[:no_codesign] || false
  config_only = options[:config_only] || false
  commit = last_git_commit

  command = "flutter build #{type}  --release --no-pub --suppress-analytics"
  command += " --build-number=#{build_number}" if build_number.to_s != ""
  command += " --build-name=#{version_number}" if version_number.to_s != ""
  command += " --no-codesign" if no_codesign
  command += " --config-only" if config_only

	UI.message("Building #{type} - version: #{version_number} - build: #{build_number} - commit: #{commit[:abbreviated_commit_hash]}")

  fetch_dependencies

  # Check if build_runner exists in pubspec.yaml
  # If it does, run the build_runner command
  if File.exist?("#{root_path}/pubspec.yaml")
    pubspec_content = File.read("#{root_path}/pubspec.yaml")
    if pubspec_content.include?("build_runner:")
      build_autogenerated_code
    end
  end

  sh_on_root(command: command)
end

# Tasks to be reused on each platform flow
lane :test do |options|
  sh_on_root(command: "flutter test --no-pub --coverage --suppress-analytics")
end


# Private lane to verify all environment variables are set
private_lane :verify_env do |options|
	# array of ENVS to check
	envs = options.fetch(:envs, [])

	envs.each do |env|
		if ENV[env].nil? || ENV[env].empty?
			UI.user_error!("ENV \\"#{env}\\" is not set. Please set it in your environment variables (e.g. ios/fastlane/.env)")
		end
	end
end

# A helper method to get the path to the firebase service account json file
def google_service_account_json_path
  root_path + '/' + (ENV["GOOGLE_SERVICE_ACCOUNT_JSON_PATH"] || 'google_service_account.json')
end

# Build number is a unique identifier for each build that is uploaded to the app store.
# This method will get the latest build number from the app store and increment it by 1.
# Ensure authenticate_apple_store is called before this method
def get_build_number(store)
  return get_new_build_number(
    bundle_identifier: store == "appstore" ? ENV["APP_BUNDLE_ID"] : nil,
    package_name: store == "playstore" ? ENV["APP_PACKAGE_NAME"] : nil,
    google_play_json_key_path: google_service_account_json_path
  ).to_s
end


def get_version_from_pubspec
  require 'yaml'
  
  # Define the correct path to pubspec.yaml relative to the Fastlane directory
  pubspec_path = File.expand_path("#{root_path}/pubspec.yaml")

  # Check if the file exists to avoid errors
  unless File.exist?(pubspec_path)
    UI.error("pubspec.yaml file not found at path: #{pubspec_path}")
    return nil
  end

  # Parse the pubspec.yaml file
  pubspec_content = File.read(pubspec_path)

  # Use regex to find the version number line and extract both version number and build number
  version_line = pubspec_content.match(/version:\\s*(\\d+\\.\\d+\\.\\d+)\\+(\\d+)/)
  if version_line
    version_number = version_line[1]
  else
    UI.error("Version number not found in pubspec.yaml")
    return nil
  end

  return version_number
end
''',
    'google_service_account.json': '''
Follow this guide to create a service account JSON file: https://docs.fastlane.tools/actions/supply/#setup
''',
    'android/key.properties': '''
storePassword=<the password you used when generating the key>
keyPassword=<the password you used when generating the key>
keyAlias=release
storeFile=../key.jks
''',
    '''.github/workflows/deploy-with-fastlane.yaml''': r'''
name: Publish iOS and Android release

on:
  release:
    types: [published]

env:
  FLUTTER_CHANNEL: "stable"
  RUBY_VERSION: "3.2.2"

jobs:
  build_ios:
    name: Build iOS
    # You can upgrade to more powerful machines if you need to
    # See https://docs.github.com/en/actions/using-github-hosted-runners/about-larger-runners/about-larger-runners#about-macos-larger-runners
    runs-on: macos-latest
    # Depending on how long your build takes, you might want to increase the timeou
    timeout-minutes: 20
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Ruby
        uses: ruby/setup-ruby@v1
        with:
          ruby-version: ${{ env.RUBY_VERSION }}
          bundler-cache: true
          working-directory: 'ios'

      - name: Run Flutter tasks
        uses: subosito/flutter-action@v2.16.0
        with:
          # Remember to specify flutter version in pubspec.yaml under environment
          # https://github.com/subosito/flutter-action?tab=readme-ov-file#use-version-from-pubspecyaml
          flutter-version-file: 'pubspec.yaml'
          channel: ${{ env.FLUTTER_CHANNEL }}
          cache: true

      - uses: maierj/fastlane-action@v3.1.0
        with:
          lane: 'release_app_store'
          subdirectory: ios
          options: '{ "version_number": "${{ github.ref_name }}" }'
        env:
          ASC_KEY_ID: ${{ secrets.ASC_KEY_ID }}
          ASC_ISSUER_ID: ${{ secrets.ASC_ISSUER_ID }}
          ASC_KEY_P8_BASE64: ${{ secrets.ASC_KEY_P8_BASE64 }}
          MATCH_PASSWORD: ${{ secrets.MATCH_PASSWORD }}
          MATCH_GIT_BASIC_AUTHORIZATION: ${{ secrets.MATCH_GIT_BASIC_AUTHORIZATION }}
          APP_BUNDLE_ID: ${{ secrets.APP_BUNDLE_ID }}

  notify_ios:
    name: Send Slack Notification about iOS build
    needs: [build_ios]
    runs-on: ubuntu-latest
    timeout-minutes: 2
    steps:
      - name: Send Slack Notification about iOS build
        uses: rtCamp/action-slack-notify@v2
        if: ${{ !cancelled() && (success() || failure()) && env.SLACK_LOGS_WEBHOOK_PRESENT == 'true' }}
        env:
          SLACK_LOGS_WEBHOOK_PRESENT: ${{ secrets.SLACK_LOGS_WEBHOOK && 'true' || 'false' }}
          SLACK_WEBHOOK: ${{ secrets.SLACK_LOGS_WEBHOOK }}
          SLACK_CHANNEL: logs
          SLACK_USERNAME: "${{ github.repository_owner }}"
          SLACK_ICON: "https://github.com/${{ github.repository_owner }}.png?size=250"
          SLACK_COLOR: "${{ contains(needs.*.result, 'success') && 'good' || 'danger' }}"
          SLACK_TITLE: "${{ contains(needs.*.result, 'success') && 'Successfully released' || 'Error during release of' }} ${{ github.ref_name }} for iOS to TestFlight"
          SLACK_FOOTER: "DevOps"
          SLACK_MESSAGE: "${{ contains(needs.*.result, 'success') && 'Released:' || 'Release failed:' }} ${{github.event.head_commit.message}}"

  build_android:
    name: Build Android
    runs-on: ubuntu-latest
    timeout-minutes: 20
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Ruby
        uses: ruby/setup-ruby@v1
        with:
          ruby-version: ${{ env.RUBY_VERSION }}
          bundler-cache: true
          working-directory: 'android'

      - name: Run Flutter tasks
        uses: subosito/flutter-action@v2.16.0
        with:
          flutter-version-file: 'pubspec.yaml'
          channel: ${{ env.FLUTTER_CHANNEL }}
          cache: true

      - name: Create google_service_account.json
        run: |
          echo "${{ secrets.FIREBASE_SERVICE_ACCOUNT_BASE64 }}" | base64 --decode > google_service_account.json

      - name: Create key.jks
        run: |
          echo "${{ secrets.ANDROID_KEYSTORE_FILE_BASE64 }}" | base64 --decode > android/key.jks

      - name: Create key.properties
        run: |
          cat <<EOF > android/key.properties
          storePassword=${{ secrets.ANDROID_KEY_STORE_PASSWORD }}
          keyPassword=${{ secrets.ANDROID_KEY_STORE_PASSWORD }}
          keyAlias=release
          storeFile=../key.jks
          EOF
        env:
          ANDROID_KEY_STORE_PASSWORD: ${{ secrets.ANDROID_KEY_STORE_PASSWORD }}

      - uses: maierj/fastlane-action@v3.1.0
        with:
          lane: 'release_play_store'
          subdirectory: android
          options: '{ "version_number": "${{ github.ref_name }}" }'
        env:
          APP_PACKAGE_NAME: ${{ secrets.APP_PACKAGE_NAME }}

  notify_android:
    name: Send Slack Notification about Android build
    needs: [build_android]
    runs-on: ubuntu-latest
    timeout-minutes: 2
    steps:
      - name: Send Slack Notification about Android build
        uses: rtCamp/action-slack-notify@v2
        if: ${{ !cancelled() && (success() || failure()) && env.SLACK_LOGS_WEBHOOK_PRESENT == 'true' }}
        env:
          SLACK_LOGS_WEBHOOK_PRESENT: ${{ secrets.SLACK_LOGS_WEBHOOK && 'true' || 'false' }}
          SLACK_WEBHOOK: ${{ secrets.SLACK_LOGS_WEBHOOK }}
          SLACK_CHANNEL: logs
          SLACK_USERNAME: "${{ github.repository_owner }}"
          SLACK_ICON: "https://github.com/${{ github.repository_owner }}.png?size=250"
          SLACK_COLOR: "${{ contains(needs.*.result, 'success') && 'good' || 'danger' }}"
          SLACK_TITLE: "${{ contains(needs.*.result, 'success') && 'Successfully released' || 'Error during release of' }} ${{ github.ref_name }} for Android to Play Store"
          SLACK_FOOTER: "DevOps"
          SLACK_MESSAGE: "${{ contains(needs.*.result, 'success') && 'Released:' || 'Release failed:' }} ${{github.event.head_commit.message}}"
''',
  };

  // verify if the files already exist
  List<String> existingFiles = [];

  files.forEach((path, content) {
    if (File.fromUri(Uri.file(path)).existsSync()) {
      existingFiles.add(path);
    }
  });

  bool override = false;

  // ask if he wish to override the file
  if (existingFiles.isNotEmpty) {
    print('The following files already exist:');
    existingFiles.forEach((file) {
      print(file);
    });
    stdout.write('Do you wish to override the files? (y/n): ');
    String? answer = stdin.readLineSync();

    override = answer?.toLowerCase() == 'y';
  }

  files.forEach((path, content) {
    // if it exists and the user doesn't want to override, skip
    if (File.fromUri(Uri.file(path)).existsSync() && !override) {
      return;
    }

    File file = File(path);
    file.createSync(recursive: true);
    file.writeAsStringSync(content);
    print('File $path created successfully.');
  });

  // Check if .gitignore contains '*.jks*, key.properties, google_service_account.json'
  // and if not, append them

  File gitignore = File('.gitignore');
  if (gitignore.existsSync()) {
    String content = gitignore.readAsStringSync();
    if (!content.contains('.env')) {
      gitignore.writeAsStringSync('.env\n', mode: FileMode.append);
    }
    if (!content.contains('*.jks')) {
      gitignore.writeAsStringSync('*.jks\n', mode: FileMode.append);
    }
    if (!content.contains('key.properties')) {
      gitignore.writeAsStringSync('key.properties\n', mode: FileMode.append);
    }
    if (!content.contains('google_service_account.json')) {
      gitignore.writeAsStringSync('google_service_account.json\n',
          mode: FileMode.append);
    }

    if (!content.contains('**/fastlane/report.xml')) {
      gitignore.writeAsStringSync('**/fastlane/report.xml\n',
          mode: FileMode.append);
    }

    if (!content.contains('**/fastlane/Preview.html')) {
      gitignore.writeAsStringSync('**/fastlane/Preview.html\n',
          mode: FileMode.append);
    }

    if (!content.contains('**/fastlane/screenshots')) {
      gitignore.writeAsStringSync('**/fastlane/screenshots\n',
          mode: FileMode.append);
    }

    if (!content.contains('**/fastlane/test_output')) {
      gitignore.writeAsStringSync('**/fastlane/test_output\n',
          mode: FileMode.append);
    }
  }

  // Modify `android/app/build.gradle` and ensure it contains the following,
  // ```gradle
  // def keystoreProperties = new Properties()
  // def keystorePropertiesFile = rootProject.file('key.properties')
  // if (keystorePropertiesFile.exists()) {
  //     keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
  // }
  // ```

  File androidBuildGradle = File('android/app/build.gradle');

  if (androidBuildGradle.existsSync()) {
    // Ask if user wants to automatically add the required configurations

    print(
        'Do you want to automatically add the required configurations to android/app/build.gradle? (y/n): ');

    String? answer = stdin.readLineSync();

    if (answer?.toLowerCase() == 'y') {
      // Read the content of the file
      String content = androidBuildGradle.readAsStringSync();
      if (!content.contains('def keystoreProperties = new Properties()')) {
        print('Adding keystoreProperties to android/app/build.gradle');
        // add it above the `android {` block
        content = content.replaceFirst('android {', '''
def keystoreProperties = new Properties()
def keystorePropertiesFile = rootProject.file('key.properties')
if (keystorePropertiesFile.exists()) {
    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
}

android {''');
      }

      // If it does not contain signingConfigs {
      // then add it above the buildTypes block
      if (!content.contains('signingConfigs {')) {
        print('Adding signingConfigs to android/app/build.gradle');
        content = content.replaceFirst('buildTypes {', '''
signingConfigs {
        release {
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
            storePassword keystoreProperties['storePassword']
        }
    }

    buildTypes {''');
      }

      // Set signingConfig signingConfigs.release
      print('Ensuring signingConfig is set to signingConfigs.release');
      content = content.replaceFirst(
          RegExp(r'buildTypes \{[\s\S]*?release \{[\s\S]*?\}[\s\S]*?\}'), '''
buildTypes {
        release {
            signingConfig signingConfigs.release
        }
    }''');

      // Write the content back to the file
      androidBuildGradle.writeAsStringSync(content);
    }
  }

  print('Fastlane setup completed successfully.');
}