I’ve had small Debian servers such as a RaspPi or a NUC that I’ve never updated after the initial setup and they were still working perfectly when I finally turned them off to move. If you don’t want to update a Linux system, don’t. Maybe setup auto security updates if it’s going to be exposed to the raw internet and running some open servers.

As a point of reference, I built a 32TB Synology last year. I took me an afternoon to get it done, plus set up Plex media server, all the arrs and friends, a backup server and a couple other things. Since then maintenance has consisted of remembering to hit the “update containers” button once a month or so. I should probably automate that part but just haven’t bothered yet.

A lot of NAS are capable of hosting containerized services. The Synology DS series, for example, can run everything you’ve mentioned and so much more. For a relatively gentle into check out https://mariushosting.com/

It’s alway weird to me that even though Ubuntu has the largest Linux desktop market share, no one admits to using it.

Anyway, I use Ubuntu because I was doing a lot of ROS development when I last built a machine, and getting ROS running properly on other distros can be a pain.