move postfix-forwarder from bash to systemd

scripts/postfix-forwarder.sh

-#!/bin/bash -eux
-
-docker stop postfix-forwarder
-docker rm postfix-forwarder
-docker run -p 25:25 -d --name="postfix-forwarder" -v /data/server-wide/postfix:/data indiehosters/postfix-forwarder

scripts/setup.sh

@@ -21,3 +21,12 @@ etcdctl set /services/default '{"app":"nginx", "hostname":"'$1'"}'
 mkdir -p /data/server-wide/haproxy/approved-certs
 systemctl enable haproxy.service
 systemctl start  haproxy.service
+
+# Configure and start postfix
+mkdir -p /data/server-wide/postfix
+touch /data/server-wide/postfix/hostname
+touch /data/server-wide/postfix/destinations
+touch /data/server-wide/postfix/forwards
+
+systemctl enable postfix.service
+systemctl start  postfix.service