Add debug print of prevRefs to polling logic

poll/poll.go

@@ -58,6 +58,10 @@ func pollJob(ctx context.Context, pipeline database.Pipeline, pipelineConf confi
 			log.Errorf("Could not get pipeline refs from db: %v", err)
 			return
 		}
+		log.Debugf("Got pipeline hashs for repo %v (id: %v)", pipeline.Name, pipeline.Id)
+		for refName, hash := range prevRefs {
+			log.Debugf("%v: %v: %v", pipeline.Id, refName, hash)
+		}
 
 		repo, err := git.Clone(memory.NewStorage(), nil, &git.CloneOptions{
 			URL: pipeline.Url,