Fastfile for automatically change build number

Fastfile

# This file contains the fastlane.tools configuration
# You can find the documentation at https://docs.fastlane.tools
#
# For a list of all available actions, check out
#
#     https://docs.fastlane.tools/actions
#
# For a list of all available plugins, check out
#
#     https://docs.fastlane.tools/plugins/available-plugins
#

# Uncomment the line if you want fastlane to automatically update itself
# update_fastlane

default_platform(:ios)

platform :ios do
  desc "Push a new beta build to TestFlight"
  lane :beta do
    build_number = number_of_commits()

    Dir.chdir "../../" do
      sh("flutter", "packages", "get")
      sh("flutter", "clean")
      sh("flutter", "build", "ios", "--build-number=#{build_number}")
    end

    build_app(workspace: "Runner.xcworkspace", scheme: "Runner")
    upload_to_testflight
  end
end