Feature Request: Get Slack Username from Email #349

Description

I was able to do this in Jenkins, and looking for a way to do it in GHA. I need a way to lookup a slack user's username via their email.

Github actions give context on the committer via email, but obv github doesn't provide slack user data. In order to tag a user directly, being able to lookup the user's slack id so you can tag them or message them directly would be incredibly valuable.

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• bug
• enhancement (feature request)
• question
• documentation related
• example code related
• testing related
• discussion

Requirements (place an x in each of the [ ])

• I've read and understood the Contributing guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've searched for any related issues and avoided creating a duplicate issue.

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