feat: migrate the server to MariaDB

docker/mariadb/Dockerfile

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+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

docker/mariadb/docker-entrypoint.sh

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+#!/bin/bash
+
+# chmod u+rwx /scripts/init.template.sql
+cp /scripts/init.template.sql /scripts/init.sql
+
+# Replace environment variables in SQL files with their values
+if [ -n "$MYSQL_USER" ]; then
+    sed -i "s/{MYSQL_USER}/$MYSQL_USER/g" /scripts/init.sql
+fi
+if [ -n "$MYSQL_PASSWORD" ]; then
+    sed -i "s/{MYSQL_PASSWORD}/$MYSQL_PASSWORD/g" /scripts/init.sql
+fi
+if [ -n "$MYSQL_DATABASE" ]; then
+    sed -i "s/{MYSQL_DATABASE}/$MYSQL_DATABASE/g" /scripts/init.sql
+fi
+
+# Execute SQL file
+mysql -u root -p$MYSQL_ROOT_PASSWORD < /scripts/init.sql

docker/mariadb/init.sql

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

docker/mariadb/my.cnf

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+[mysqld]
+bind-address = 0.0.0.0