~/ios/fastlane/Fastfile https://qiita.com/masashi-sutou/items/08c4d4eb5b9cb2dcd47a

Fastfile

# 共通処理を別リポジトリのFastfileから参照する
import_from_git(url: 'git@github.com:example/example-fastlane.git',
                path: 'util/Fastfile')

default_platform(:ios)

platform :ios do

  before_all do |lane, options|

    setup_env_in_util
    ENV["EXAMPLE_DEV_APP_ID"] = "com.example.name.development"
    setup_circle_ci
  end

  after_all do |lane|

    slack(message: "Successfully push development to Deploygate.") if lane == :development
  end

  desc 'Build and deploy debug'
  lane :development do

    build_flutter_in_util(
      platform: "ios",
      flavor: "development",
      target: "lib/main_development.dart"
    )
    
    certificate_development_in_util(
      app_identifiers: [ENV["EXAMPLE_DEV_APP_ID"]],
      force: false
    )

    change_manual_code_signing_style_in_util(
      app_configs: [
        {
          target: "Runner",
          profile_name_app_id: ENV["EXAMPLE_DEV_APP_ID"],
        }
      ],
      mode: "development"
    )

    build_ios_app(
      scheme: "Development",
      output_directory: scripts_mkdir_in_util,
      export_method: "development"
    )

    deploygate_in_util(
      release_note: changelog_from_git_commits(merge_commit_filtering: "exclude_merges")
    )
  end
end