fix mysql custom config

Dockerfile

@@ -1,8 +1,9 @@
 FROM mariadb:10
 
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -q -y cron sudo automysqlbackup
-RUN touch /etc/mysql/mariadb.conf.d/settings.cnf && chown mysql /etc/mysql/mariadb.conf.d/settings.cnf
 
+COPY mysql.cnf /etc/mysql/mariadb.conf.d/settings.cnf
+RUN chown mysql /etc/mysql/mariadb.conf.d/settings.cnf
 COPY docker-entrypoint.sh /usr/local/bin/
 COPY automysqlbackup /etc/default
 COPY sudoers /etc/sudoers.d/mysudoers