feat: set up git hooks

git-hooks.nix

@@ -0,0 +1,44 @@
+{
+  nixpkgs,
+  git-hooks,
+  system,
+  src,
+}:
+let
+  pkgs = nixpkgs.legacyPackages.${system};
+
+  pre-commit-check = git-hooks.lib.${system}.run {
+    inherit src;
+    hooks = {
+      nixfmt.enable = true;
+      statix.enable = true;
+      deadnix.enable = true;
+    };
+  };
+in
+{
+  checks = {
+    inherit pre-commit-check;
+  };
+
+  formatter =
+    let
+      inherit (pre-commit-check) config;
+      inherit (config) package configFile;
+      script = ''
+        ${pkgs.lib.getExe package} run --all-files --config ${configFile}
+      '';
+    in
+    pkgs.writeShellScriptBin "pre-commit-run" script;
+
+  devShells = {
+    default =
+      let
+        inherit (pre-commit-check) shellHook enabledPackages;
+      in
+      pkgs.mkShell {
+        inherit shellHook;
+        buildInputs = enabledPackages;
+      };
+  };
+}