code: func GetBuild(c context.Context, host, taskId string) (*ui.MiloBuildLegacy, error) {
  	if taskId == "" {
  		return nil, errors.New("no swarming task id", grpcutil.InvalidArgumentTag)
  	}
  
  	sf, err := NewProdService(c, host)
  	if err != nil {
  		return nil, err
  	}
  
  	return SwarmingBuildImpl(c, sf, taskId)
  }
docs: // GetBuild returns a milo build from a swarming task id.