code: def get_container_output(backend, image_name, command, image_tag="latest",
                           additional_opts=None):
      
      image = backend.ImageClass(image_name, tag=image_tag)
      # FIXME: use run_via_api and make this a generic function
      c = image.run_via_binary(DockerRunBuilder(command=command, additional_opts=additional_opts))
      try:
          c.wait()
          return c.logs_unicode()
      finally:
          c.stop()
          c.wait()
          c.delete()
docs: Create a throw-away container based on provided image and tag, run the supplied command in it
      and return output. The container is stopped and removed after it exits.
  
      :param backend: instance of DockerBackend
      :param image_name: str, name of the container image
      :param command: list of str, command to run in the container
      :param image_tag: str, container image tag, defaults to "latest"
      :param additional_opts: list of str, by default this function creates the container using
          docker binary and run command; with this argument you can supply addition options to the
          "docker run" invocation
      :return: str (unicode), output of the container