This is what I'm using, I've written a module for Podman pods (which behave a bit like docker-compose stacks, though with a lit less powerful networking).
You can also run NixOS containers[1] - so you have a "real" NixOS configuration for your service that is still separated from the rest of the system via systemd-nspawn.
You can also run NixOS containers[1] - so you have a "real" NixOS configuration for your service that is still separated from the rest of the system via systemd-nspawn.
[1]https://nixos.wiki/wiki/NixOS_Containers