clarify that github.env is not related to env

[jsoref]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/actions/learn-github-actions/contexts#github-context

What part(s) of the article would you like to see updated?

The text for github.env says:

Path on the runner to the file that sets environment variables from workflow commands. This file is unique to the current step and is a different file for each step in a job. For more information, see "Workflow commands for GitHub Actions."

Two things to add:

1. Not to be confused with env.
2. Not available in jobs.<*>.if for the same reason that env isn't -- see https://docs.github.com/en/actions/learn-github-actions/contexts#context-availability

Additional information

I ran into a PR where someone was trying to use github.env.foo in a jobs[*].if to work around the fact that env isn't available at this point.

[nguyenalex836]

@jsoref Thank you for raising this issue! I'll get this triaged for review ✨ Our team will provide feedback regarding the best next steps for this issue - thanks for your patience! 💛