docs: @TaskAction
    public void stageAction() throws AppEngineException {
      getProject().delete(appYamlExtension.getStagingDirectory());
      getProject().mkdir(appYamlExtension.getStagingDirectory().getAbsolutePath());
  
      AppYamlProjectStaging staging = new AppYamlProjectStaging();
      staging.stageArchive(appYamlExtension.toAppYamlProjectStageConfiguration());
    }