app_containers: Add TODO about DBus in userns

Because things like dbus can be broken inside.

app_containers/.local/bin/run_app_container

@@ -29,6 +29,10 @@ if [ -f "$config" ]; then
   source "$config"
 fi
 
+# Kill any previously running instances
+# This could be due to, say, a broken libappindicator icon (because of broken dbus)
+sudo -A machinectl kill $CONTAINER_NAME > /dev/null 2>&1
+
 # Create a XDG_RUNTIME_DIR for guest on host
 container_xdg_runtime="$(mktemp -d -p /var/tmp)"
 trap cleanup EXIT
@@ -75,6 +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