watchdog: use dig instead of check_dns (#6685)

* watchdog: use dig instead of check_dns

check_dns is slower and uses more system resources,
dig wrapped in a script is a more performant approach and uses
fewer system resources

* added debug mode + compose image bump

---------

Co-authored-by: maxi322 <maxi322@users.noreply.github.com>
Co-authored-by: DerLinkman <niklas.meyer@servercow.de>

data/Dockerfiles/watchdog/watchdog.sh

@@ -1,5 +1,10 @@
 #!/bin/bash
 
+if [ "${DEV_MODE}" != "n" ]; then
+  echo -e "\e[31mEnabled Debug Mode\e[0m"
+  set -x
+fi
+
 trap "exit" INT TERM
 trap "kill 0" EXIT
 
@@ -297,7 +302,7 @@ unbound_checks() {
     touch /tmp/unbound-mailcow; echo "$(tail -50 /tmp/unbound-mailcow)" > /tmp/unbound-mailcow
     host_ip=$(get_container_ip unbound-mailcow)
     err_c_cur=${err_count}
-    /usr/lib/nagios/plugins/check_dns -s ${host_ip} -H stackoverflow.com 2>> /tmp/unbound-mailcow 1>&2; err_count=$(( ${err_count} + $? ))
+    /usr/lib/mailcow/check_dns.sh -s ${host_ip} -H stackoverflow.com 2>> /tmp/unbound-mailcow 1>&2; err_count=$(( ${err_count} + $? ))
     DNSSEC=$(dig com +dnssec | egrep 'flags:.+ad')
     if [[ -z ${DNSSEC} ]]; then
       echo "DNSSEC failure" 2>> /tmp/unbound-mailcow 1>&2