以下操作在本地计算机上正常工作，但在检查到circleci时失败：

mysql:
  image: mysql:5.7
  ports:
    - 3306:3306
  environment:
    - MYSQL_ALLOW_EMPTY_PASSWORD=true
    - MYSQL_ROOT_HOST=%
  restart: always
  volumes:
    - ./docker/mysql/mysqld.cnf:/etc/mysql/conf.d/mysql.cnf

checkout 的项目下有一个文件位于./docker/mysql/mysqld.cnf。
circleci上显示的错误是：
错误：for proj-server\u mysql\u 1 cannot start service mysql:b'oci runtime error:container\u linux.go:265:starting container process caused“process\u linux.go:368:container init caused\”rootfs\u linux.go:57:mounting\”/home/circleci/max/proj server/docker/mysql/mysqld.cnf\”to rootfs\\“/var/lib/docker/aufs/mnt/4a9af90d342b491ae92af5a88360d2e34fce0d21c15f8a648767e89fb51aa\\”at\\“/var/lib/docker/aufs/mnt/4a9af90d342b491ae92af5a88360d2e34fce0d21c15f8a64876e89fb51aa/etc/mysql/conf.d/mysql.cnf\\”导致“\”不是目录“\”\n:是否尝试将目录装入文件（反之亦然）？检查指定的主机路径是否存在并且是预期的类型'