Create finish script for vpn_guard service

Add finish script to handle Nginx failure in vpn_guard.

qbittorrent/rootfs/etc/services.d/vpn_guard/finish

@@ -0,0 +1,8 @@
+#!/usr/bin/execlineb -S0
+# ==============================================================================
+# Take down the S6 supervision tree when Nginx fails
+# ==============================================================================
+if { s6-test ${1} -ne 0 }
+if { s6-test ${1} -ne 256 }
+
+s6-svscanctl -t /var/run/s6/services