[Tile-serving] [openstreetmap/mod_tile] running render_list in container take forever to finish (Issue #462)

[Hummeltech]

It could take quite some time with `2` threads as there are `16384` metatiles (`1048576` tiles) needing to be rendered. You might try increasing `--num-threads` and `--max-load` to your number of CPUs/cores (e.g. `--max-load $(nproc) --num-threads $(nproc)`.) You will likely want to change the `num_threads` setting in your `renderd.conf` file's `[renderd]` section(s) to `-1`.

I also see at least one issue with your command. You need to adjust the `--tile-dir` option in order to match what you have set in your `renderd.conf` file.
```shell
render_list  \
        --all \
        --map polaruang \
        --max-zoom 10 \
        --min-zoom 10 \
        --num-threads 2 \
        --tile-dir /var/lib/mod_tile
```


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