Verify that Forgejo Runner can access a reusable workflow that is stored in a private repository.
That should help prevent https://code.forgejo.org/forgejo/runner/issues/1274 from happening again.
Reviewed-on: https://code.forgejo.org/forgejo/end-to-end/pulls/1436
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.code.forgejo.org>
Co-authored-by: Andreas Ahlenstorf <andreas@ahlenstorf.ch>
Co-committed-by: Andreas Ahlenstorf <andreas@ahlenstorf.ch>
