code: func validateImage(image string) error {
  	if image == "" {
  		return status.Errorf(codes.InvalidArgument, "ContainerSpec: image reference must be provided")
  	}
  
  	if _, err := reference.ParseNormalizedNamed(image); err != nil {
  		return status.Errorf(codes.InvalidArgument, "ContainerSpec: %q is not a valid repository/tag", image)
  	}
  	return nil
  }
docs: // validateImage validates image name in containerSpec