Move forwarding host script to Docker image

data/Dockerfiles/postfix/whitelist_forwardinghosts.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+while read QUERY; do
+	QUERY=($QUERY)
+	if [ "${QUERY[0]}" != "get" ]; then
+		echo "500 dunno"
+		continue
+	fi
+	result=$(curl -s http://nginx:8081/forwardinghosts.php?host=${QUERY[1]})
+	logger -t whitelist_forwardinghosts -p mail.info "Look up ${QUERY[1]} on whitelist, result $result"
+	echo ${result}
+done