Update shell.nix with dependencies

- Add .envrc, .direnv to gitignore

.gitignore

@@ -1,2 +1,4 @@
 /dist
 result
+.direnv/
+.envrc

bin/make

@@ -0,0 +1,3 @@
+#!env bash
+
+make $*

envrc.sample

@@ -0,0 +1,2 @@
+use flake .
+gomod2nix 

shell.nix

@@ -1,4 +1,5 @@
-{ pkgs ? (
+{
+  pkgs ? (
     let
       inherit (builtins) fetchTree fromJSON readFile;
       inherit ((fromJSON (readFile ./flake.lock)).nodes) nixpkgs gomod2nix;
@@ -8,17 +9,17 @@
           (import "${fetchTree gomod2nix.locked}/overlay.nix")
         ];
       }
-  )
-, mkGoEnv ? pkgs.mkGoEnv
-, gomod2nix ? pkgs.gomod2nix
-}:
-
-let
+  ),
+  mkGoEnv ? pkgs.mkGoEnv,
+  gomod2nix ? pkgs.gomod2nix,
+}: let
   goEnv = mkGoEnv {pwd = ./.;};
 in
   pkgs.mkShell {
     packages = [
       goEnv
       gomod2nix
+      pkgs.go_1_21
+      pkgs.pre-commit
     ];
   }