[enhancement]: create github automation for packaging PRs to test quilt patches succeed

# Enhancement

To help ease the review burden for packaging PRs and to make them less error prone, I propose adding a basic github action that tests that `quilt push -a` and `quilt pop -a` (or whatever the commands are) succeed. This would be a super simple starting place and we could expand upon it from there but I think the development effort required for this would be incredibly minimal and would pay dividends.

Optionally, we could also maybe run `tox -e py3` in between quilt pushing and popping to try to add another layer of protection against breaking functionality.

this action should be restricted to PRs where target branch matches the pattern `ubuntu/*`.