code: func (u *Usage) Show() error {
  	b := u.handler
  	defer u.garbage.Cleanup(u.config)
  
  	b.SetScripts([]string{constants.Usage}, []string{})
  
  	if err := b.Prepare(u.config); err != nil {
  		return err
  	}
  
  	return b.Execute(constants.Usage, "", u.config)
  }
docs: // Show starts the builder container and invokes the usage script on it
  // to print usage information for the script.