Had somebody wonder why there was no docker container to run roundup.
So here is a ticket for it. Suggest using SQLite for it's configured backend.

Not sure how configuring other elements would work. My guess is the tracker homedir
would be exposed to the underlying OS.

Also consider a docker-compose to run containers for roundup, email service and
a back end like mysql or postgresql.

See also https://github.com/turnkeylinux-apps/roundup where come pre-config is
done for their turnkey app. Maybe some ideas can be had from there?