always allow dbus connections from root

needed for cage-xtwrapper

sys/machines/nixdesk/default.nix

@@ -1,5 +1,6 @@
 {
   lib,
+  pkgs,
   inputs,
   systemProfiles,
   specialArgs,
@@ -95,6 +96,17 @@
 
   networking.hostName = "nixdesk";
 
+  # for running waydroid as root, needed for cage-xtmapper
+  services.dbus.packages = [
+    (pkgs.writeTextDir "/etc/dbus-1/session.d/dbus-allow-root.conf" ''
+      <busconfig>
+        <policy context="mandatory">
+          <allow user="root"/>
+        </policy>
+      </busconfig>
+    '')
+  ];
+
   nixpkgs.config = {
     # rocmSupport = true;
     allowUnfreePredicate = pkg: