This looks pretty neat! Once the FOSS self-hostable version is out I might try it out for my local hackerspace, it seems like it might be useful for those little things that are too small to warrant standing up infrastructure at our small scale.
If you're up to it, I can send you an email when it's ready to try, likely tomorrow. The Dockerfile is mostly working as is, you just need to setup the DB, pass the connection info and do some manual superadmin rows insertion. I will automate the process asap.
Running the docker on the other hand require to pass a few env variables, among them the connection info to a PG instance. It also require to setup an user by editing directly the database and hashing by hand your password which is super inconvenient. I am working right now on making the process easier, did not expect self-host users so early.
You are right, I will prepare a public docker image and some clear instructions. Things went a bit fast today, I initially planned to do such launch in a few weeks.