code: func (p *PortOpt) String() string {
  	ports := []string{}
  	for _, port := range p.ports {
  		repr := fmt.Sprintf("%v:%v/%s/%s", port.PublishedPort, port.TargetPort, port.Protocol, port.PublishMode)
  		ports = append(ports, repr)
  	}
  	return strings.Join(ports, ", ")
  }
docs: // String returns a string repr of this option