帮我把这个命令转换成docker compose docker run -d --network some-network --name some-mongo -e MONGO_INITDB_ROOT_USERNAME=mongoadmin -e MONGO_INITDB_ROOT_PASSWORD=secret mongo

version: '3' services: some-mongo: image: mongo environment: MONGO_INITDB_ROOT_USERNAME: mongoadmin MONGO_INITDB_ROOT_PASSWORD: secret networks: - some-network networks: some-network: external: true