[SOGo] Added hooks support for SOGo image (#4181)

Signed-off-by: Kristian Feldsam <feldsam@gmail.com>

data/Dockerfiles/sogo/docker-entrypoint.sh

@@ -10,4 +10,12 @@ if [[ ! -z ${REDIS_SLAVEOF_IP} ]]; then
   cp /etc/syslog-ng/syslog-ng-redis_slave.conf /etc/syslog-ng/syslog-ng.conf
 fi
 
+# Run hooks
+for file in /hooks/*; do
+  if [ -x "${file}" ]; then
+    echo "Running hook ${file}"
+    "${file}"
+  fi
+done
+
 exec "$@"