docs: def _add_tag_file(zip_file, dir_name, tag_info_list, tag_tup):
      """Add a tag file to zip_file and record info for the tag manifest file."""
      tag_name, tag_str = tag_tup
      tag_path = d1_common.utils.filesystem.gen_safe_path(dir_name, tag_name)
      tag_iter = _create_and_add_tag_iter(zip_file, tag_path, tag_str)
      tag_info_list.append(
          {
              'path': tag_path,
              'checksum': d1_common.checksum.calculate_checksum_on_iterator(
                  tag_iter, TAG_CHECKSUM_ALGO
              ),
          }
      )