nix: setup linter to lint python files

This sets up the `ruff` linter for python code linting.

Signed-off-by: Taimoor Zaeem <taimoorzaeem@gmail.com>

nix/tools/style.nix

@@ -8,6 +8,7 @@
 , hsie
 , nixpkgs-fmt
 , python3Packages
+, ruff
 , silver-searcher
 , statix
 , stylish-haskell
@@ -64,10 +65,14 @@ let
         echo "Scanning nix files for unused code..."
         ${deadnix}/bin/deadnix -f
 
+        # ruff has gaps in scanning for unused code, so we use vulture
         echo "Scanning python files for unused code..."
         ${silver-searcher}/bin/ag -l --vimgrep -g '\.l?py$' . \
           | xargs ${python3Packages.vulture}/bin/vulture --exclude docs/conf.py
 
+        echo "Linting python files..."
+        ${ruff}/bin/ruff check .
+
         echo "Checking consistency of import aliases in Haskell code..."
         ${hsie} check-aliases main src