Add package cleanup hook

[k8ieone]

This hook removes the pacman cache after each pacman transaction, removing the need to run pacman -S --clean --noconfirm after installing packages.

[tulilirockz]

What concerns me is that I'd like to not break downstream workflows, do we need to do this?

[k8ieone]

No, not really. I've just seen this used around on e.g. https://github.com/lopsided98/archlinux-docker/blob/master/rootfs/common/usr/share/libalpm/hooks/package-cleanup.hook

If you're going to be cleaning the packages after each install to save space using pacman -S --clean --noconfirm it makes sense to me to automate things imo.

Is there any situation where you'd want to keep the cached packages?

[tulilirockz]

Honestly, no idea 😆 - I'd just imagine that this might be an issue somehow for downstreams as this kind of stuff always kind of breaks things later.

[k8ieone]

Ah, okay 😄

I mean we can either keep this open or just close it and keep it in the "archive", maybe add it in at some point. To me it just seemed like an easy improvement to do but I haven't really thought about the possible consequences of doing this automatically 😅