Unexpected behaviour on list of environment variables.

So the issue when I trie to provide multiple env vars
```
environment: ENVIRONMENT=production,AWS_WHITE_LIST=foo.bar,jenkins,bar.baz,baz.foo,DB_NAME=sfasfsf,DB_USERNAME=asdasdasd,SLACK_CHANNEL_ID=QWERTY
```
On providing `AWS_WHITE_LIST` it will read only to `foo.bar` first element, and then it stops and will go to next env var. Escaping. quoting won't work here.

使用 issue 中的环境示例作为复现案例，并跟踪 action 如何解析 `environment` 输入。验证包含逗号的 `AWS_WHITE_LIST` 值如何与后续变量分隔，然后确认完整示例在不截断该值的情况下得到处理。

由索引模型根据 Issue 内容生成。