Update: I pushed the container to the Github Container Registry.
You can just pull it with:
docker pull ghcr.io/marco79cgn/audio2tonie:latest
I also included an additional wrapper for the original opus2tonie python script. Call it from your host with:
docker run --rm -v $(pwd):/data ghcr.io/marco79cgn/audio2tonie opus2tonie ...
And of course all of the previous comment still applies to the transcode command, e.g.:
docker run --rm -v $(pwd):/data ghcr.io/marco79cgn/audio2tonie transcode -s /data/audiobook.mp3