Add missing pdnsmysql fix file

services/pdnsmysql/fix

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+# FIXME we need to figure out WHY, but sometimes the pdnsmysql container
+# freezes until it initiates a network connection.
+# Since that container doesn't include ping, we have to initiate something
+# else that initiates a connection to the outside world.
+# The root cause is likely a bug in docker networking.
+docker exec pdnsmysql apt update