add more debug output to contributor test trigger

[pmeier]

Reference Issues or PRs

What does this implement/fix?

It seems neither I nor @iameskild have permissions to trigger the contributor tests through a bot comment. Most likely, our check is not set up properly. This PR adds some debug outputs so we can see what role we actually need to check for.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

• Did you test the pull request locally?
• Did you add new tests?

Any other comments?