.oniro-ci: use repo --reference conditionally

The reference is provided only when repo is used with runner persistent storage. This is not a major change, just a clean-up of the existing logic.

Signed-off-by: Zygmunt Krynicki zygmunt.krynicki@huawei.com

approved this merge request

approved this merge request

enabled an automatic merge when the pipeline for 2732add0 succeeds

merged