feat: migrate the server to MariaDB

docker/mariadb/Dockerfile

@@ -1,4 +1,4 @@
-FROM mysql:5.7
+FROM mariadb:10.2
 
 USER root
 ADD my.cnf /etc/mysql/conf.d/my.cnf
@@ -17,7 +17,7 @@ ENV MYSQL_ROOT_PASSWORD=$MYSQL_ROOT_PASSWORD
 COPY ./init.sql /scripts/init.template.sql
 COPY ./docker-entrypoint.sh /docker-entrypoint-initdb.d/docker-initialize.sh
 
-# The scripts in the docker-entrypoint-initdb.d/ directory are executed as
+# The scripts in the `docker-entrypoint-initdb.d/` directory are executed as
 # the mysql user inside the MySQL Docker container.
 RUN chown -R mysql:root /docker-entrypoint-initdb.d
 RUN chown -R mysql:root /scripts

docker/mariadb/init.sql

@@ -1,2 +1,3 @@
 GRANT ALL PRIVILEGES ON *.* TO '{MYSQL_USER}'@'%' IDENTIFIED BY '{MYSQL_PASSWORD}' WITH GRANT OPTION;
+
 FLUSH PRIVILEGES;