flake/dev: add a convenient devshell

flake-modules/dev/default.nix

@@ -0,0 +1,22 @@
+{inputs, ...}: {
+  imports = [
+    inputs.pre-commit-hooks.flakeModule
+    ./devshell.nix
+  ];
+
+  perSystem = {pkgs, ...}: {
+    formatter = pkgs.alejandra;
+
+    pre-commit = {
+      settings.hooks = {
+        alejandra.enable = true;
+        statix = {
+          enable = true;
+          excludes = [
+            "plugins/lsp/language-servers/rust-analyzer-config.nix"
+          ];
+        };
+      };
+    };
+  };
+}