Update TestGitPipelineRun to use subtests 🌻
Update TestGitPipelineRun to use subtests 🌻

It should help us identify more easly which revisions failed.

Signed-off-by: Vincent Demeester <b98c0fd48a8945096c766de790fe70420dd2f223@redhat.com>

tektoncd/pipeline,tektoncd/pipeline