Upload_To_Testflight.groovy

stage('Upload to TestFlight') {
  withEnv(["FASTLANE_USER=fastlane_user_email_address"]) {
    withCredentials([
      string([
           credentialsId: 'fastlane_password_id', 
           variable: 'FASTLANE_PASSWORD']),
       ]) {
         sh "bundle exec fastlane upload_to_testflight"
       }
  }
}