Tag each uploaded beta with version and current build number. It's pretty sweet.

Tag each beta

lane :beta do
  ensure_git_status_clean
  latestBuildNumber = bump_build_number

  # Git tag must not already exist. If it does, check if we forgot to bump version or
  # delete previous tag on remote.
  git_tag_name = "v#{version}(#{latestBuildNumber})"
  UI.crash!("Git tag #{git_tag_name} already exists.") if git_tag_exists(tag: git_tag_name)

  build_app(scheme: "Volante")
  upload_to_testflight(skip_waiting_for_build_processing: true)

  # Create a git tag,
  add_git_tag(tag: git_tag_name)
  push_git_tags

  increment_build_number(build_number: 0, xcodeproj: "Volante.xcodeproj")
end

def bump_build_number
  latestBuildNumber = latest_testflight_build_number(
    version: version,
    initial_build_number: 0
    )
  return increment_build_number(
    build_number: latestBuildNumber + 1,
    xcodeproj: "Volante.xcodeproj"
    )
end