code: func (Pipe) Publish(ctx *context.Context) error {
  	var images = ctx.Artifacts.Filter(artifact.ByType(artifact.PublishableDockerImage)).List()
  	for _, image := range images {
  		if err := dockerPush(ctx, image); err != nil {
  			return err
  		}
  	}
  	return nil
  }
docs: // Publish the docker images