Make system update a meson option

[leolost2605]

Problem

Since #88 this has a dependency on packagekit. I'm really not sure here but a while ago I dug a bit through sodalite config (amazing project btw :)) and i saw it being blacklisted or something? So I wonder whether system updates via packagekit should be a meson option (like it was in appcenter)? Maybe @electricduck can give some input here 🤷

Proposal

Make it a meson option

Prior Art (Optional)

No response

[danirabbit]

I think what they'd probably like more is if updates worked with rpm-ostree 😅 But I'm +1 on that as a stopgap if it would help them out

[danirabbit]

Looks like the way to do this is with systemd sysupdate https://www.freedesktop.org/software/systemd/man/latest/systemd-sysupdate.html