I hope someone will create a Debian package for Immich. I’m running a bunch of services and they are all nicely organized with user foo, /var/lib/foo, journalctl -u foo, systemctl start foo, except for Immich which is the odd one out needing docker compose. The nix package shows it can be done but it would probably be a fair amount of work to translate to a Debian package.

I'll try to install in a short-ish while, and look into its installation in a detailed manner.

I may try to package it, and if it proves to be easy to maintain, I might file an ITP.

You could try setting it up as a Podman Quadlets, those hook into systemd so you can treat them like a normal service.