code: func (h *fs) CreateWorkingDirectory() (directory string, err error) {
  	directory, err = ioutil.TempDir("", "s2i")
  	if err != nil {
  		return "", s2ierr.NewWorkDirError(directory, err)
  	}
  
  	return directory, err
  }
docs: // CreateWorkingDirectory creates a directory to be used for STI