app_containers: Add TODO about DBus in userns

app_containers/.local/bin/run_app_container

@@ -79,6 +79,8 @@ if [ "$CONTAINER_USE_USERNS" = true ]; then
   private_users=$(shuf -i 65536-$((2147483647 - 65536)) -n1) # Pick a random starting offset
   bind_opts="idmap"
   user_on_host=$((private_users + run_as))
+  # TODO: DBus is broken inside a user namespace due to permission issues
+  # TODO: Fix this, somehow.
 fi
 
 # Grant the user inside the container access to the Wayland / Xorg display