[SOGo] Check if master, only run DB prep if master, use correct syslog-ng config if not master

data/Dockerfiles/sogo/docker-entrypoint.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+if [[ ! -z ${REDIS_SLAVEOF_IP} ]]; then
+  cp /etc/syslog-ng/syslog-ng-redis_slave.conf /etc/syslog-ng/syslog-ng.conf
+fi
+
+exec "$@"