Example Fastlane Setup

.env.prod

# General Constants
APP_NAME = "myProject – PROD" # So you can identify your app in Slack, logs, etc.

# Team
USERNAME = "appstore@yourcompany.com" # The Username that you use to log in to AppStore Connect, or developer.apple.com
TEAM_ID = "ABCDEFGH"

# Code Signing
BUNDLE_ID = "com.yourproject.ent.prod" # Your App Bundle Identifier

# Gym
GYM_BUILD_SCHEME = "myproject-prod" # The Build scheme as it is called in Xcode
GYM_EXPORT_METHOD = "enterprise" # development, ad-hoc, enterprise, app-store

# Match
MATCH_TYPE = "enterprise" # development, adhoc, enterprise, appstore
MATCH_GIT_URL = "ssh://git@gitlab.yourinstance.net/ios-team/certificates" # Path to your match certificates repo
MATCH_GIT_BRANCH = "master" # Customize if needed, e.g. for different teams

# Updraft. You can generate this in your Updraft project settings
UPDRAFT_URL = "https://getupdraft.com/api/app_upload/some-updraft-url" 

# Slack
SLACK_URL = "https://hooks.slack.com/services/some-slack-webhook" # A custom Slack Incoming Webhook, you can generate this through Slack.

# Firebase
GSP_APP_ID = "1:some:id:ios"

Fastfile

import_from_git(url: "https://github.com/appswithlove/fastlane_tools.git", branch: "master")

fastlane_require 'xcov'

platform :ios do
  ##### QUALITY #####

  desc "Lint code"
  lane :lint do
    cocoapods(try_repo_update_on_error: true)
    swiftlint(
      reporter: "codeclimate",
      output_file: "./fastlane/swiftlint.json",
      path: "./"
    )
  end

  desc "Run all tests" 
  lane :test do
    cocoapods(try_repo_update_on_error: true)
    scan
    xcov(
      scheme: ENV["GYM_BUILD_SCHEME"],
      output_directory: "./fastlane/xcov_output",
      html_report: true,
      markdown_report: true,
      json_report: true
    )
  end

  ##### BUILD #####

  desc "Builds"
  lane :build do 
    match(readonly: true)
    clear_derived_data
    cocoapods(try_repo_update_on_error: true)
    increment_build
    gym(output_name: "#{ENV['GYM_BUILD_SCHEME']}.ipa")
  end

  ##### DEPLOY #####

  desc "Builds the app and uploads to Updraft"
  lane :deploy_updraft do
    build
    updraft
    post_build_notification
    upload_symbols_to_crashlytics(verbose: true, app_id: ENV["GSP_APP_ID"])
  end

  ##### HELPERS #####

  desc "Get certificates, pass 'dist:true' for distribution, create:true' for creation, 'force:true' to force"
  lane :certificates do |options|
    match(
      type: options[:dist] ? ENV["MATCH_TYPE"] : "development",
      readonly: options[:create] ? false : true,
      force: options[:force] ? true : false,
      force_for_new_devices: options[:create] ? true : false
    )
  end

  desc "Increment build number to current date and time in UTC, eg. 20190913.1427"
  lane :increment_build do 
  	increment_build_number build_number: Time.new.utc.strftime("%Y%m%d.%H%M")
  end

  desc "Download dSYM files from iTC and upload to Crashlytics. (Apple generates new dSYM when a build is uploaded with bitcode enabled)."
  lane :refresh_dsyms do
    download_dsyms(team_id: ENV["TEAM_ID"])                  # Download dSYM files from iTC
    upload_symbols_to_crashlytics(app_id: ENV["GSP_APP_ID"], binary_path: "./fastlane/upload-symbols")   # Upload them to Crashlytics
    clean_build_artifacts           # Delete the local dSYM files
  end

  desc "Register new device"
  lane :register_new_device do  |options|
      device_name = prompt(text: "Enter the device name: ")
      device_udid = prompt(text: "Enter the device UDID: ")
      device_hash = {}
      device_hash[device_name] = device_udid
      register_devices(devices: device_hash)
      certificates(
        create:true
      )
  end
end

Gymfile

scheme ENV["GYM_BUILD_SCHEME"]
export_method ENV["GYM_EXPORT_METHOD"]
# Repeat for all values Fastlane reads from other configuration files (Matchfile etc.)