docker-compose for php-apache mysql phpmyadmin

docker-compose.yml

version: "3.1"
services:
    www:
        build: .
        restart: always
        ports:
            - "8100:80"
        volumes:
            - ./app:/var/www/html/
        links:
            - db
    db:
        image: mysql:8.0
        restart: always
        ports:
            - "3306:3306"
        command: --default-authentication-plugin=mysql_native_password
        environment:
            MYSQL_DATABASE: myDb
            MYSQL_USER: user
            MYSQL_PASSWORD: test
            MYSQL_ROOT_PASSWORD: test
        volumes:
            - ./dump:/docker-entrypoint-initdb.d
            - ./conf:/etc/mysql/conf.d
            - persistent:/var/lib/mysql
    phpmyadmin:
        image: phpmyadmin/phpmyadmin
        restart: always
        links:
            - db:db
        ports:
            - 8101:80
        environment:
            MYSQL_USER: user
            MYSQL_PASSWORD: test
            MYSQL_ROOT_PASSWORD: test

networks:
  default:
    external:
      name: nginx-proxy

volumes:
    persistent: