It does evaluate for macOS – at least when I’m not busy adding a
warning to `x86_64-darwin` – but Darwin‐only changes to the test
driver won’t cause rebuilds on Hydra anyway.
We can't eval all nixos tests, this would be way too expensive. But we
can evaluate `nixosTests.simple` as an indication whether the nixos test
driver has changed. If that's the case, this means that *all* NixOS
tests need to be rebuilt.
By now, these files have been changed enough to not need the "vendored
from" notes anymore. These links would still be there when going through
the history of the file, but today GHA CI has not many similarities
anymore to what ofborg did, so these are not really helpful.
These files are tightly coupled with the code in ci/eval and not used
anywhere else. They are subject to the same backporting requirements as
the remaining CI code. They are better placed next here.
