Adding Firebase app distribution

gistfile1.txt

default_platform(:android)
platform :android do

    desc "this lane uploads QA build to app testers"
    lane :uploadQA do
        gradle(
  task: "clean assemble",
  flavor: "qa",
  build_type: "Debug"
)
 firebase_app_distribution(
            service_credentials_file: "firebase-distribution-key.json",
            app: ENV['APP_ID_QA'],
            release_notes: "Lots of amazing new features to test out!",
            groups: "qa"
        )
       
    end
  
end