Initialize db service

docker-compose.yml

version: "3.8"
services:
    db:
        image: mysql:5.7
        container_name: mysql
        restart: always
        volumes:
            - ./mysql-dump:/var/lib/mysql
            - ./mysql-init:/docker-entrypoint-initdb.d
        environment:
            MYSQL_ROOT_PASSWORD: root
            MYSQL_DATABASE: contactbook
            MYSQL_USER: user
            MYSQL_PASSWORD: pass
        ports:
            - "3306:3306"
    pma:
    web: