added healthcheck

Dockerfile

@@ -1,13 +1,13 @@
 FROM mariadb:10
 
-RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -q -y cron sudo automysqlbackup
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -q -y cron sudo automysqlbackup
 
 COPY mysql.cnf /etc/mysql/mariadb.conf.d/settings.cnf
 RUN chown mysql:mysql /etc/mysql/mariadb.conf.d/settings.cnf
 COPY docker-entrypoint.sh /usr/local/bin/
+COPY healthcheck.sh /usr/local/bin/
 COPY automysqlbackup /etc/default
 COPY sudoers /etc/sudoers.d/mysudoers
 
-
-#HEALTHCHECK
-
+HEALTHCHECK CMD /usr/local/bin/healthcheck.sh