code: def push_images():
      # type: () -> None
      
      registry = conf.get('docker.registry')
      docker_images = conf.get('docker.images', [])
  
      if registry is None:
          log.err("You must define docker.registry conf variable to push images")
          sys.exit(-1)
  
      for image in docker_images:
          push_image(registry, image)
docs: Push all project docker images to a remote registry.