code: func transformStartContainerError(err error) error {
  	if err == nil {
  		return nil
  	}
  	matches := startRE.FindStringSubmatch(err.Error())
  	if len(matches) > 0 {
  		return fmt.Errorf("executable not found in $PATH")
  	}
  	return err
  }
docs: // transformStartContainerError does regex parsing on returned error
  // for where container runtimes are giving less than ideal error messages.