[CI] only run the credentials and riff-raff steps for our own branches (not forks, since it will fail) #4152
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Although the CI is now running for external PRs (from forks) 👍 they're failing when they get to the credentials & riff-raff steps (as they're supposed to). This PR makes those last steps conditional, so external contributors still get their CI checks/tests.
Related: #4146 and #4148