docs: def push(collector, image, **kwargs):
      """Push an image"""
      if not image.image_index:
          raise BadOption("The chosen image does not have a image_index configuration", wanted=image.name)
      tag = kwargs["artifact"]
      if tag is NotSpecified:
          tag = collector.configuration["harpoon"].tag
      if tag is not NotSpecified:
          image.tag = tag
      Builder().make_image(image, collector.configuration["images"], pushing=True)
      Syncer().push(image)