module(system.apps.lutris): Move lutris from flatpak to system to benefit of system graphics driver

modules/system/apps/default.nix

@@ -3,6 +3,7 @@
 {
   imports = [
     ./flatpak.nix
+    ./lutris.nix
     ./qemu.nix
     ./steam.nix
   ];

modules/system/apps/lutris.nix

@@ -0,0 +1,17 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+let
+  cfg = config.modules.system.apps.lutris;
+in
+{
+  options.modules.system.apps.lutris = {
+    enable = mkEnableOption ''
+      Enable lutris
+    '';
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [ lutris ];
+  };
+}