[Watchdog] Add check for IPv6 NAT: Make sure IPv6 NAT container was started at least 30s after other containers

[Compose] ipv6nat depends on all containers
[Compose] Update watchdog image

docker-compose.yml

@@ -342,7 +342,7 @@ services:
         - /lib/modules:/lib/modules:ro
 
     watchdog-mailcow:
-      image: mailcow/watchdog:1.30
+      image: mailcow/watchdog:1.31
       # Debug
       #command: /watchdog.sh
       build: ./data/Dockerfiles/watchdog
@@ -391,6 +391,22 @@ services:
             - dockerapi
 
     ipv6nat:
+      depends_on:
+        - unbound-mailcow
+        - mysql-mailcow
+        - redis-mailcow
+        - clamd-mailcow
+        - rspamd-mailcow
+        - php-fpm-mailcow
+        - sogo-mailcow
+        - dovecot-mailcow
+        - postfix-mailcow
+        - memcached-mailcow
+        - nginx-mailcow
+        - acme-mailcow
+        - netfilter-mailcow
+        - watchdog-mailcow
+        - dockerapi-mailcow
       image: robbertkl/ipv6nat
       restart: always
       privileged: true