Ryan Wang dcb7a89b82 docs: add description of the docker environment variable (#137) ...

为部署文档提供 Docker 环境变量的解释。

/kind documentation

```release-note
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2022-12-16 03:42:41 +00:00

..

docker-env.md

docs: add description of the docker environment variable (#137)

2022-12-16 03:42:41 +00:00