Sample fastlane script to upload your app to TestFlight

desc "Push a new beta build to TestFlight with Prod Config"
lane :beta do
    ensure_git_status_clean
    increment_build_number(xcodeproj: "yourAppProj.xcodeproj")
    build_ios_app(
        scheme: "yourTargetScheme",
        configuration: "Release",
        export_method: "app-store"
    )
    upload_to_testflight(skip_waiting_for_build_processing: true)
    commit_version_bump(xcodeproj: "yourAppProj.xcodeproj")
    add_git_tag
    push_to_git_remote
end