fixup! tools: do not download build tools when linting Nix files

Author: aduh95

.github/workflows/nix-changes.yml

@@ -112,7 +112,8 @@ jobs:
       - name: Lint Nix files
         run: |
           NIX_LINTER=$(nix-instantiate --eval --raw -E '(import ./shell.nix {}).NIX_LINTER')
-          nix-store --realise "${NIX_LINTER%/bin/*}"
+          # Attempt to get it from cache, and fallback to building `devTools.nix` otherwise.
+          nix-store --realise "${NIX_LINTER%/bin/*}" || nix-build -I nixpkgs=tools/nix/pkgs.nix ./tools/nix/devTools.nix --no-out-link
           "$NIX_LINTER" --quiet --ci && EXIT_CODE="$?" || EXIT_CODE="$?"
           if [ "$EXIT_CODE" != "0" ]
           then