code: func buildLabelOptions(labels map[string]string, stages []instructions.Stage) {
  	keys := []string{}
  	for key := range labels {
  		keys = append(keys, key)
  	}
  
  	// Sort the label to have a repeatable order
  	sort.Strings(keys)
  	for _, key := range keys {
  		value := labels[key]
  		stages[len(stages)-1].AddCommand(instructions.NewLabelCommand(key, value, true))
  	}
  }
docs: // Build 'LABEL' command(s) from '--label' options and add to the last stage