[Watchdog] Send mails with priority 1

data/Dockerfiles/watchdog/watchdog.sh

@@ -113,6 +113,7 @@ function mail_error() {
       --charset=UTF-8 \
       --subject="${SUBJECT}" \
       --body-plain="${BODY}" \
+      --add-header="X-Priority: 1" \
       --to=${rcpt} \
       --from="watchdog@${MAILCOW_HOSTNAME}" \
       --hello-host=${MAILCOW_HOSTNAME} \

docker-compose.yml

@@ -396,7 +396,7 @@ services:
         - /lib/modules:/lib/modules:ro
 
     watchdog-mailcow:
-      image: mailcow/watchdog:1.76
+      image: mailcow/watchdog:1.77
       # Debug
       #command: /watchdog.sh
       dns: