code: def render_pull_base_image(self):
          
          phase = 'prebuild_plugins'
          plugin = 'pull_base_image'
  
          if self.user_params.parent_images_digests.value:
              self.pt.set_plugin_arg(phase, plugin, 'parent_images_digests',
                                     self.user_params.parent_images_digests.value)
docs: Configure pull_base_image