Fix CI for external contributors: rosetta docker build failure #6758
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This PR modifies the CI step to pass the requesting repo for pull requests, so that the clone operation points at the correct repo.
When the run is not a pull request -- for example, hourly develop builds -- the
BUILDKITE_PULL_REQUEST_REPO
environment variable will be set to the empty string. Omitting the newMINA_REPO
argument or passing the empty string will fall back to the main repo.Checklist: