Set run-name for dispatch workflows

[dawidd6]

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#run-name

This will help us to get a better grip on which workflow run did what.

[dawidd6]

Example: https://github.com/Homebrew/homebrew-core/actions/runs/3137195718

[MikeMcQuaid]

This doesn't look great. Could we append a URL or "pull request #" or something?