Let's make this behave more like all the rest of the meson stuff. This also is the first step to making it a bit more flexible so we can define integration tests in different ways as will be seen in the next commits.
Instead of deny-listing the test on Ubuntu CI, so it gets enabled automagically once btrfs-progs is updated to a newer version there.
The Ubuntu CIs are deny-listed because the shipped btrfs-progs is too old, i.e. doesn't support the recently-added 'filesystem mkswapfile' command.
Daan De Meyer
Frantisek Sumsal
Mike Yuan