@Override
  public void finish(TileArchiveMetadata metadata) {
    if (writeTilesOnly) {
      return;
    }
    writeEntryFlush(new FinishEntry(metadata));
  }
exposing meta data (non-tile data) might be useful for most use cases but complicates parsing for simple use cases
=> allow to output tiles, only
planetiler-core/src/main/java/com/onthegomap/planetiler/stream/WriteableJsonStreamArchive.java