完善以上的docker compose文件包括数据库的容器配置

version: '3.7' services: web: build: . ports: - "8000:8000" depends_on: - db db: image: mysql:latest command: --default-authentication-plugin=mysql_native_password environment: MYSQL_ROOT_PASSWORD: example MYSQL_DATABASE: mydatabase MYSQL_USER: myuser MYSQL_PASSWORD: mypassword volumes: - db_data:/var/lib/mysql volumes: db_data: {}