code: func PullControlPlaneImages(runtime utilruntime.ContainerRuntime, cfg *kubeadmapi.ClusterConfiguration) error {
  	images := images.GetControlPlaneImages(cfg)
  	for _, image := range images {
  		if err := runtime.PullImage(image); err != nil {
  			return errors.Wrapf(err, "failed to pull image %q", image)
  		}
  		fmt.Printf("[config/images] Pulled %s\n", image)
  	}
  	return nil
  }
docs: // PullControlPlaneImages pulls all images that the ImagesPull knows about