Docker compose's don't really need to be maintained though. As long as the app doesn't need new components old docker composes should work.
EDIT: Oops, it does look like spacebarchat's docker images have last been updated over 2 years ago:
https://hub.docker.com/r/spacebarchat/server
EDIT2: Although this is outdated, I think their github repo has an action to autobuild docker images on pushes. Still investigating.
EDIT3: Okay, they don't seem to be actually ran.
But using nix to build a docker image is pretty cool.
EDIT4: Oh shit, the docker image build workflows were added just 2 hours ago. Of course they haven't been ran!
Docker support soon, probably.
EDIT5: the workflow ran, but it looks like it's private for now.
Similar: anuraos, https://github.com/MercuryWorkshop/anuraOS
Anuraos is special because it uses a js linux emulator to execute linux apps. Very, very slowly. But it's there and there is even gui support.