ci-cd: Setup fastlane

flutter-example/Gemfile

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+source "https://rubygems.org"
+
+gem "fastlane", "2.199.0"

flutter-example/fastlane/Fastfile

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+
+default_platform(:ios)
+
+platform :ios do
+  desc "Deploy app"
+  lane :app_deploy do |options|
+    app_build options
+    app_testflight options
+  end
+
+  desc "Build app"
+  lane :app_build do |options|
+    cocoapods()
+
+    build_app(
+      workspace: "app.xcworkspace",
+      scheme: "app",
+      xcargs: "CURRENT_PROJECT_VERSION='#{options[:version]}'"
+    )
+  end
+
+  desc "Upload app to testflight"
+  lane :app_testflight do |options|
+    upload_to_testflight(
+      api_key_path: ENV['APP_STORE_CONNECT_API_KEY_FILE'],
+      skip_waiting_for_build_processing: true
+    )
+  end
+end