Filter derivation by regex

[shimunn]

Addresses #72

Adds an extra optional flag to attic push: --filter which can be used like so:

attic push /run/current-system/ --filter '^((steam|appimage)-run|(nvidia|rust).*)$'

Which would push the whole system closure execpt store paths matching the regex such as stream-run, appimage-run or rust releated derivations.

I guess it would make sense, to integrate this functionally into other commands such as watch-store as well, I'll be happy to patch those commands as well if this feature is of interest.

[shimunn]

It might even make sense to extend this to not only serve as blacklist but as a general filter. Maybe even to check if the path has been built with 'perferLocalBuild'.

[gador]

Just wanted to say that I use this PR and it works like a charm. I'd love to see this merged

[msfjarvis]

I've rebased this PR's changes on e5c8d2d in case someone else also needs it, I haven't tested it yet other than running nix flake check.

0001-feat-push-filter-derivation-by-regex.txt

Edit: had a typo 😬

0001-feat-push-filter-derivation-by-regex.txt