Can I read options from Environment variables?

First of all thanks for creating this nice package. Been using it for a lot of projects and it's working fine as always :)

I was wondering if it's possible to read options from environment variables as well as from command params?
When I'm running my app in a docker container I would like to be able to edit my env variables in the container and then reflect that to my startup options.

In the old repo, I found this issue https://github.com/gsscoder/commandline/issues/58 but can't seem to find the implementation in the new repo. Was it never implemented or planned as a feature or are they other ways to resolve my "problem"?

If not I can always just read the env variables myself and update the startup options if needed.

该 issue 未指定任何文件、测试或入口点。首先检查命令行选项解析 API 和所引用的 issue #58，然后确定是否应支持环境变量，以及它们应如何与命令行值交互。报告中未定义完成标准。

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