app_containers: Kill all previously running instances

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