docker-compose.yml 文件中＆符号的含义
今天在搭建一个superset，发现docker-compose.yml文件有个&部分看不懂。x-superset-image: &superset-image apache/superset:latest-devx-superset-user: &superset-user rootx-superset-depends-on: &superset-depends-on - db - redisx-superset-volume
