feat: migrate the server to MariaDB

docker/mariadb/Dockerfile

@@ -0,0 +1,26 @@
+FROM mariadb:10.2
+
+USER root
+ADD my.cnf /etc/mysql/conf.d/my.cnf
+
+ARG MYSQL_DATABASE=default_database
+ARG MYSQL_USER=default_user
+ARG MYSQL_PASSWORD=secret
+ARG MYSQL_ROOT_PASSWORD=root
+
+ENV MYSQL_DATABASE=$MYSQL_DATABASE
+ENV MYSQL_USER=$MYSQL_USER
+ENV MYSQL_PASSWORD=$MYSQL_PASSWORD
+ENV MYSQL_ROOT_PASSWORD=$MYSQL_ROOT_PASSWORD
+
+# Copy init sql file with env vars and then the script will substitute the variables.
+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 mysql user inside the MySQL Docker container.
+RUN chown -R mysql:root /docker-entrypoint-initdb.d
+RUN chown -R mysql:root /scripts
+
+CMD ["mysqld"]
+EXPOSE 3306