def get_runner_image_name(base_images_project, test_image_suffix):
  """Returns the runner image that should be used, based on
  |base_images_project|. Returns the testing image if |test_image_suffix|."""
  image = f'gcr.io/{base_images_project}/base-runner'
  if test_image_suffix:
    image += '-' + test_image_suffix
  return image