Docker MySQL Server

docker-compose.yml

version: '3.7'
services:
    db:
        container_name: mysql_server
        image: mariadb
        restart: always
        environment:
            MYSQL_USER: "user"
            MYSQL_PASSWORD: "password"
            MYSQL_DATABASE: "db"
            MYSQL_RANDOM_ROOT_PASSWORD: "yes"
        ports:
            - "3306:3306"
        networks:
            - db
    phpmyadmin:
        container_name: mysql_phpmyadmin
        image: phpmyadmin/phpmyadmin
        restart: always
        environment:
            PMA_HOST: db
        ports:
            - "8080:80"
        networks:
            - db
networks:
    db: