feat: Set up devshell

.gitignore

@@ -1,3 +1,4 @@
 tags
 .luarc.json
 /result
+.devenv

flake.nix

@@ -7,6 +7,9 @@
     nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
     nixCats.url = "github:BirdeeHub/nixCats-nvim";
 
+    devenv.url = "github:cachix/devenv";
+    marleyos.url = "git+https://codewith.babesonthe.net/punkfairie/marleyos";
+
     neovim-nightly-overlay = {
       url = "github:nix-community/neovim-nightly-overlay";
     };
@@ -27,10 +30,16 @@
     };
   };
 
+  nixConfig = {
+    extra-trusted-public-keys = "devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw=";
+    extra-substituters = "https://devenv.cachix.org";
+  };
+
   outputs = {
     self,
     nixpkgs,
     nixCats,
+    devenv,
     ...
   } @ inputs: let
     inherit (nixCats) utils;
@@ -366,17 +375,36 @@
       defaultPackage = nixCatsBuilder defaultPackageName;
       pkgs = import nixpkgs {inherit system;};
     in {
-      packages = utils.mkAllWithDefault defaultPackage;
-
-      # Choose your package for devShell and add whatever else you want in it.
-      devShells = {
-        default = pkgs.mkShell {
-          name = defaultPackageName;
-          packages = [defaultPackage];
-          inputsFrom = [];
-          shellHook = ''
-          '';
+      packages =
+        (utils.mkAllWithDefault defaultPackage)
+        // {
+          devenv-up = self.devShells.${system}.default.config.procfileScript;
+          devenv-test = self.devShells.${system}.default.config.test;
         };
+
+      devShells.default = devenv.lib.mkShell {
+        inherit inputs pkgs;
+        modules = [
+          ({
+            pkgs,
+            config,
+            ...
+          }: {
+            packages = [
+              defaultPackage
+            ];
+
+            pre-commit.hooks = {
+              alejandra.enable = true;
+              deadnix.enable = true;
+              statix.enable = true;
+              stylua.enable = true;
+              end-of-file-fixer.enable = true;
+              trim-trailing-whitespace.enable = true;
+              no-commit-to-branch.enable = true;
+            };
+          })
+        ];
       };
     })
     // (let