Should Buffrs Care About Repository Dirtiness?

[asmello]

          I wrote the same code yesterday and irrc this doesn't filter out ignored files - rather you need to do `Some(Default::default())`. Did you test this?

Likewise - why does this matter to buffrs? Surely for buffrs there are like 2 files that matter and who cares if the user has a bunch of other files edited - that's not buffrs' purpose. Surely it should only care about buffrs files?

And some tool which manages overall CI should care about dirtiness? It's actually very common for publish scripts to end up with a dirty repo with both Rust and Python when using git versions, because you have to write the versions into the packages.

Originally posted by @j-baker in #38 (comment)