Actually, I wonder if just bumping the `nix: 2.1` to `nix: 2.2` would work...
Lettuce find out.
there's an open issue for the travis configuration IIRC
so don't think 2.2 exists yet
Well, judging by the fact there's no yellow dot on that commit, I daresay you're right. Then I'll remove the yml in a separate commit and it can be reverted when support for 2.2 exists (if we want to have both GHA and travis for redundancy)