pinwheel: Add enable option for zsh module

hosts/pinwheel/modules/default.nix

@@ -19,6 +19,7 @@ in
       foot.enable = true;
 
       git.enable = true;
+      zsh.enable = true;
       openvpn.enable = true;
       go.enable = true;
       rust.enable = true;

hosts/pinwheel/modules/zsh/default.nix

@@ -1,5 +1,15 @@
-{ pkgs, lib, ... }:
+{ pkgs, lib, config, ... }:
+let
+  enabled = config.mod.zsh.enable;
+in
 {
+  options = {
+    mod.zsh = {
+      enable = lib.mkEnableOption "enable zsh module";
+    };
+  };
+
+  config = lib.mkIf enabled {
     home-manager.users.alex = {
       programs.zsh = {
         enable = true;
@@ -56,4 +66,5 @@
 
     programs.zsh.enable = true;
     environment.pathsToLink = [ "/share/zsh" ];
+  };
 }