code: func (n ImageName) String() string {
  	buf := bytes.Buffer{}
  	if n.Registry != "" {
  		buf.WriteString(n.Registry)
  		buf.WriteString("/")
  	}
  	if n.Repository != "" {
  		buf.WriteString(n.Repository)
  		buf.WriteString("/")
  	}
  	buf.WriteString(n.Name)
  	if n.Digest != "" {
  		buf.WriteString("@")
  		buf.WriteString(n.Digest)
  	} else {
  		buf.WriteString(":")
  		buf.WriteString(n.Tag)
  	}
  	return buf.String()
  }
docs: // String implements the Stringer interface