feat(gaming): add enable option

modules/gaming/default.nix

@@ -1,50 +1,56 @@
 {
-  config,
   lib,
+  config,
   pkgs,
   ...
 }:
 
+let
+  cfg = config.gaming;
+in
 {
-  nixpkgs.allowedUnfree = [
-    "steam"
-    "steam-unwrapped"
-    "lutris"
-  ];
+  options.gaming.enable = lib.mkEnableOption "gaming";
 
-  hardware.graphics = {
-    enable32Bit = true;
-    extraPackages = with pkgs; [
-      dxvk
-      vkd3d-proton
+  config = lib.mkIf cfg.enable {
+    nixpkgs.allowedUnfree = [
+      "steam"
+      "steam-unwrapped"
+      "lutris"
+    ];
+
+    hardware.graphics = {
+      enable32Bit = true;
+      extraPackages = with pkgs; [
+        dxvk
+        vkd3d-proton
+      ];
+    };
+
+    programs.steam = {
+      enable = true;
+      remotePlay.openFirewall = false;
+      dedicatedServer.openFirewall = false;
+    };
+
+    programs.gamemode.enable = true;
+
+    environment.systemPackages = with pkgs; [
+      mangohud
+    ];
+
+    home-manager.users.${config.host.username} = {
+      xdg.configFile."lutris/system.yml".text = lib.generators.toJSON { } {
+        system.game_path = "/home/${config.host.username}/games";
+      };
+    };
+
+    security.pam.loginLimits = [
+      {
+        domain = config.host.username;
+        type = "hard";
+        item = "nofile";
+        value = "524288";
+      }
     ];
   };
-
-  programs.steam = {
-    enable = true;
-    remotePlay.openFirewall = false;
-    dedicatedServer.openFirewall = false;
-  };
-
-  programs.gamemode.enable = true;
-
-  environment.systemPackages = with pkgs; [
-    # lutris
-    mangohud
-  ];
-
-  home-manager.users.${config.host.username} = {
-    xdg.configFile."lutris/system.yml".text = lib.generators.toJSON { } {
-      system.game_path = "/home/${config.host.username}/games";
-    };
-  };
-
-  security.pam.loginLimits = [
-    {
-      domain = config.host.username;
-      type = "hard";
-      item = "nofile";
-      value = "524288";
-    }
-  ];
 }