Make sure envs created during steps are also recognized

[Yaminyam]

Is your feature request related to a problem? Please describe.

As shown below, the value of GITHUB_ENV created during execution is not recognized by extention.
However, since this method is officially recommended by GitHub https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-an-environment-variable I think the created env should also be able to recognize it.

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[muzimuzhi]

duplicate of #47

[KevinPartingtonTR]

Careful about marking as a dup: #47 is a broader discussion about being able to preset/predeclare environment variables, as well as to handle the dynamic creation of environment variables.