[Watchdog] Revert to Alpine 3.11, needs fixes

data/Dockerfiles/watchdog/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.13
+FROM alpine:3.11
 LABEL maintainer "André Peters <andre.peters@servercow.de>"
 
 # Installation

data/Dockerfiles/watchdog/watchdog.sh

@@ -309,7 +309,7 @@ mysql_checks() {
     touch /tmp/mysql-mailcow; echo "$(tail -50 /tmp/mysql-mailcow)" > /tmp/mysql-mailcow
     err_c_cur=${err_count}
     /usr/lib/nagios/plugins/check_mysql -s /var/run/mysqld/mysqld.sock -u ${DBUSER} -p ${DBPASS} -d ${DBNAME} 2>> /tmp/mysql-mailcow 1>&2; err_count=$(( ${err_count} + $? ))
-    #/usr/lib/nagios/plugins/check_mysql_query -s /var/run/mysqld/mysqld.sock -u ${DBUSER} -p ${DBPASS} -d ${DBNAME} -q "SELECT COUNT(*) FROM information_schema.tables" 2>> /tmp/mysql-mailcow 1>&2; err_count=$(( ${err_count} + $? ))
+    /usr/lib/nagios/plugins/check_mysql_query -s /var/run/mysqld/mysqld.sock -u ${DBUSER} -p ${DBPASS} -d ${DBNAME} -q "SELECT COUNT(*) FROM information_schema.tables" 2>> /tmp/mysql-mailcow 1>&2; err_count=$(( ${err_count} + $? ))
     [ ${err_c_cur} -eq ${err_count} ] && [ ! $((${err_count} - 1)) -lt 0 ] && err_count=$((${err_count} - 1)) diff_c=1
     [ ${err_c_cur} -ne ${err_count} ] && diff_c=$(( ${err_c_cur} - ${err_count} ))
     progress "MySQL/MariaDB" ${THRESHOLD} $(( ${THRESHOLD} - ${err_count} )) ${diff_c}

docker-compose.yml

@@ -413,7 +413,7 @@ services:
         - /lib/modules:/lib/modules:ro
 
     watchdog-mailcow:
-      image: mailcow/watchdog:1.87
+      image: mailcow/watchdog:1.88
       # Debug
       #command: /watchdog.sh
       dns: