code: func (stages Stages) ByTarget(target string) (Stages, bool) {
  	if len(target) == 0 {
  		return stages, true
  	}
  	for i, stage := range stages {
  		if stage.Name == target {
  			return stages[i : i+1], true
  		}
  	}
  	return nil, false
  }
docs: // Get just the target stage.