Both images use the same startSeedNode.sh script so inspect it to see what environment variables you can tweak.
In order to build image:
docker build . -f docker/prod/Dockerfile -t bisq/seednode
Run:
docker run bisq/seednode
You might want to mount tor hidden service directory:
docker run -v /your/tor/dir:/root/.local/share/seednode/btc_mainnet/tor/hiddenservice/ bisq/seednode
docker-compose build