docs: def pull(self, action, image_name, **kwargs):
          """
          Pulls an image for a container configuration
  
          :param action: Action configuration.
          :type action: dockermap.map.runner.ActionConfig
          :param image_name: Image name.
          :type image_name: unicode | str
          :param kwargs: Additional keyword arguments to complement or override the configuration-based values.
          :type kwargs: dict
          """
          config_id = action.config_id
          registry, __, image = config_id.config_name.rpartition('/')
          if registry and '.' in registry and registry not in self._login_registries:
              self.login(action, registry, insecure_registry=kwargs.get('insecure_registry'))
          log.info("Pulling image %s:%s.", config_id.config_name, config_id.instance_name)
          res = action.client.pull(repository=config_id.config_name, tag=config_id.instance_name, **kwargs)
          log.debug("Done pulling image %s:%s.", config_id.config_name, config_id.instance_name)
          self._policy.images[action.client_name].refresh_repo(config_id.config_name)
          log.debug("Refreshed image cache for repo %s.", config_id.config_name)
          return res