Heyo Clonk enthusiasts,
The image can of course be fed command line arguments. Take this example of how to run the image:
docker run -p 11111:11111/tcp -p 11112:11112/tcp -p 11113:11113/udp -p 11114:11114/tcp --rm -it --name legacyclonk -v c:/data:/home/legacyclonk/data creepycrez/legacyclonk:337 /console /config:config /signup /lobby noplayer.c4p Races.c4f/Wipfrace.c4s
This specific config location (/config:config) is important and should always be supplied unless you would like to provide an alternate config file.
You can mount /home/legacyclonk/data to an empty folder on your host system. It will then be filled with the definitions and scenario folders of the base game. After it has been filled you may add your own scenarios.