Masochism, paranoia.

Another vote for Debian, and I’ll suggest you go ahead and install Jellyfin directly rather than messing with Docker.
https://jellyfin.org/downloads/server
I’d been running JF under Docker on my NAS, but when I moved to a new server I decided to just install it directly and it hasn’t been any problem at all. You’ll get a notification when it needs to be updated and it’s just a few clicks to do so. You won’t have to fight with Docker to get hardware acceleration working - which isn’t to say it won’t be a PITA, but it’s one less layer of complication.

Unfortunately I haven’t found any AI-generated music that seems interesting.

I figured you’d be concerned about music generating AI.
Personally, I’m all for it. In the early days of image generation AI you’d see lots of wild abstract outputs from the intermediate layers/processes. If we can get music to sound like that I think it would be amazing.
The thing about algorithmically generated art is that it’s basically a faucet - turn it on and get as much as you want. So there’s a danger of oversaturation, but that’s basically the case in a lot of genres of human-generated music already. It makes valuing art tricky.

I’m old

You’ll fit right in.