如何在docker-compose上为mongodb初始化新用户和数据库

version: '3'
services:
  mongodb:
    image: mongo
    restart: always
    environment:
      MONGO_INITDB_ROOT_USERNAME: root
      MONGO_INITDB_ROOT_PASSWORD: example
    ports:
      - 27017:27017
    volumes:
      - ./data:/data/db

db.createUser({
  user: 'myuser',
  pwd: 'mypassword',
  roles: [
    {
      role: 'readWrite',
      db: 'mydatabase'
    }
  ]
});

version: '3'
services:
  mongodb:
    image: mongo
    restart: always
    environment:
      MONGO_INITDB_ROOT_USERNAME: root
      MONGO_INITDB_ROOT_PASSWORD: example
    ports:
      - 27017:27017
    volumes:
      - ./data:/data/db
      - ./init.js:/docker-entrypoint-initdb.d/init.js

docker-compose up -d