[Update, Config] Set mode 600 for mailcow.conf

update.sh

@@ -101,6 +101,7 @@ while (($#)); do
 done
 
 [[ ! -f mailcow.conf ]] && { echo "mailcow.conf is missing"; exit 1;}
+chmod 600 mailcow.conf
 source mailcow.conf
 DOTS=${MAILCOW_HOSTNAME//[^.]};
 if [ ${#DOTS} -lt 2 ]; then