Docker：将mysql映像添加到项目中无法正常工作

我正在尝试将mysql添加到我的docker项目中，但我不断收到错误

db_1        | 2020-06-05T18:09:28.588053Z 0 [System] [MY-013169] [Server] /usr/sbin/mysqld (mysqld 8.0.20) initializing of server in progress as process 43
db_1        | 2020-06-05T18:09:28.611235Z 0 [ERROR] [MY-010457] [Server] --initialize specified but the data directory has files in it. Aborting.
db_1        | 2020-06-05T18:09:28.611255Z 0 [ERROR] [MY-013236] [Server] The designated data directory /var/lib/mysql/ is unusable. You can remove all files that the server added to it.
db_1        | 2020-06-05T18:09:28.613001Z 0 [ERROR] [MY-010119] [Server] Aborting
db_1        | 2020-06-05T18:09:28.613491Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.20)  MySQL Community Server - GPL.

[我做docker ps时看到

CONTAINER ID        IMAGE                      COMMAND                  CREATED             STATUS                          PORTS                    NAMES
9f561510f33d        frontend               "docker-entrypoint.s…"   4 minutes ago       Up 4 minutes                    0.0.0.0:3000->3000/tcp   frontend_1
2c3f88dc6f6b        backend                "python3 manage.py r…"   5 minutes ago       Up 5 minutes                    0.0.0.0:8000->8000/tcp   backend_1
d0768da38e93        mysql:latest           "docker-entrypoint.s…"   5 minutes ago       Restarting (1) 24 seconds ago                            db_1

我将容器var/lib放入2c3f88dc6f6b的CD中，但没有看到mysql目录。不知道是否可能是问题所在，但是如果这就是为什么没有mysql文件夹的原因？

为什么会看到该错误？

docker-compose.yml

version: "3.2"
services:
  backend:
    build: ./backend
    volumes:
      - ./backend:/app/backend
    ports:
      - "8000:8000"
    stdin_open: true
    tty: true
    command: python3 manage.py runserver 0.0.0.0:8000
    links:
      - db
  frontend:
    build: ./frontend
    volumes:
      - ./frontend:/app
      # One-way volume to use node_modules from inside image
      - /app/node_modules
    ports:
      - "3000:3000"
    environment:
      - NODE_ENV=development
      - CHOKIDAR_USEPOLLING=true
    depends_on:
      - backend
    tty: true
    command: npm start
  db:
    image: mysql:latest
    restart: always
    volumes:
      - "./.mysql/db:/var/lib/mysql"
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_DATABASE: test
      MYSQL_USER: root
      MYSQL_PASSWORD: root
    ports:
      - "3306:3306"

mysql:
    image: mysql:8.0.17
    container_name: localmysql
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: 123456
    ports:
      - 3306:3306
    volumes:
      - C:\containers_data\mysql:/var/lib/mysql

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