Use private registry

Signed-off-by: René Jochum <rene@jochum.dev>

Dockerfile

@@ -1,6 +1,6 @@
 FROM registry.jochum.dev/library/debian:buster-slim
 
-LABEL maintainer="rene@jochum.dev"
+LABEL maintainer "René Jochum <rene@jochum.dev>"
 
 RUN set -ex; \
     apt-get update --allow-releaseinfo-change && \

README.md

@@ -6,7 +6,7 @@ Dovecot IMAP/POP Submission Server for Postfixadmin.
 
 - POSTMASTER_EMAIL = 'postmaster@jochum.dev'
 - HOSTNAME = 'mail.jochum.dev'
-- RELAY_HOST = relay.fi.jochum.dev
+- RELAY_HOST = relay.fk.jochum.dev
 - RELAY_PORT - 26 for PMG else 25
 - RELAY_TRUSTED - either `yes` or `no`
     Is the relay server trusted? This determines whether we try to send (Postfix-specific) XCLIENT data to the relay server