Updated flake.nix for full compatibility.

[mikenrafter]

Description

For people using nix, the overlay provided does not work with ghcWithPackages & ghcWithHoogle.

This change fixes that.

Checklist

• [x] I've read CONTRIBUTING.md

• [x] I've considered how to best test these changes (property, unit, manually, ...) and concluded: manually

• [ ] I updated the CHANGES.md file

• [ ] I updated the XMonad.Doc.Extending file (if appropriate)

[liskin]

@mikenrafter The CI seems to be unhappy still:

Run nix develop -c cabal v2-build -O0 -j
warning: Git tree '/home/runner/work/xmonad-contrib/xmonad-contrib' is dirty
warning: creating lock file '/home/runner/work/xmonad-contrib/xmonad-contrib/flake.lock'
warning: Git tree '/home/runner/work/xmonad-contrib/xmonad-contrib' is dirty
error: infinite recursion encountered

       at /nix/store/00jky8q3q0awcgi5kiwzwvb8png1wya2-source/pkgs/stdenv/generic/make-derivation.nix:247:7:

          246|       depsHostHost                = lib.elemAt (lib.elemAt dependencies 1) 0;
          247|       buildInputs                 = lib.elemAt (lib.elemAt dependencies 1) 1;
             |       ^
          248|       depsTargetTarget            = lib.elemAt (lib.elemAt dependencies 2) 0;
(use '--show-trace' to show detailed location information)

[mikenrafter]

Yes, it appears as though I somehow placebo effected myself. I'll do further debugging and push my changes when I fix it.

[mikenrafter]

After further investigating, it turns out that ghcWithPackages, does in fact pull directly from haskellPackages. Meaning, this flake does work.

Don't you just love placebos?