Replace hacky `systemctl`/`service` wrapper (in common) to workaround `systemd` refusing to start services in chroot

[JedMeister]

Whilst it serves the purpose, we should replace the current hacky systemctl/service wrapper (in common) that works around systemd refusing to start services in chroot.

Possible options:

• do the build in a container - e.g. docker/podman, or perhaps even better, use systemd nspwan? - https://wiki.archlinux.org/title/Systemd-nspawn
• do systemd chroot workaround at build time (and undo later)- http://0pointer.de/blog/projects/changing-roots. That post is quite old now and there may be other requirements now? - E.g. see https://unix.stackexchange.com/a/457704.

TBH honest I doubt it, but perhaps there are other options?