docutils is failing while running tests with error `ValueError: unknown locale: UTF-8`. as I see there is some code to take care by setting `LANG="en_US.UTF-8"` but somehow its not working. I tried putting an overlay to skip tests and it's also not stopping the tests. what's wrong with this overlay

```
  overlay = self: super: {
    python3 = super.python3.override {
      packageOverrides = p-self: p-super: {
        docutils = p-super.docutils.overrideAttrs (old: {
          doCheck = false;
        });
      };
    };
  };

```