[Watchdog] Add missing package for IPv6 with smtp-cli, fixes #1430

data/Dockerfiles/watchdog/Dockerfile

@@ -18,6 +18,7 @@ RUN apk add --update \
   redis \
   perl \
   perl-io-socket-ssl \
+  perl-io-socket-inet6 \
   perl-socket \
   perl-socket6 \
   perl-mime-lite \

docker-compose.yml

@@ -343,7 +343,7 @@ services:
         - /lib/modules:/lib/modules:ro
 
     watchdog-mailcow:
-      image: mailcow/watchdog:1.17
+      image: mailcow/watchdog:1.18
       # Debug
       #command: /watchdog.sh
       build: ./data/Dockerfiles/watchdog