feat(waydroid): add waydroid configuration

hosts/marpa/configuration.nix

@@ -21,6 +21,7 @@
     desktop = {
       hyprland.enable = true;
       niri.enable = true;
+      waydroid.enable = true;
       xserver = {
         enable = true;
         de = "gnome";

system/desktop/default.nix

@@ -1,3 +1,8 @@
 {
-  imports = [./hyprland.nix ./niri.nix ./xserver.nix];
+  imports = [
+    ./hyprland.nix
+    ./niri.nix
+    ./waydroid.nix
+    ./xserver.nix
+  ];
 }

system/desktop/waydroid.nix

@@ -0,0 +1,15 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.mySystem.desktop.waydroid;
+in {
+  options.mySystem.desktop.waydroid.enable = mkEnableOption "Enables Waydroid";
+  config = mkIf cfg.enable {
+    virtualisation.waydroid.enable = cfg.enable;
+    environment.systemPackages = [ pkgs.waydroid-helper ];
+  };
+}