bots/submit/src/main/java/org/openjdk/skara/bots/submit/SubmitBotWorkItem.java

*** 82,11 ***
  
          var prFolder = scratchPath.resolve("submit").resolve(pr.repository().name());
  
          // Materialize the PR's target ref
          try {
!             var localRepo = Repository.materialize(prFolder, pr.repository().url(), pr.targetRef());
              var headHash = localRepo.fetch(pr.repository().url(), pr.headHash().hex());
  
              var checkBuilder = CheckBuilder.create(executor.checkName(), headHash);
              pr.createCheck(checkBuilder.build());
  
--- 82,12 ---
  
          var prFolder = scratchPath.resolve("submit").resolve(pr.repository().name());
  
          // Materialize the PR's target ref
          try {
!             var localRepo = Repository.materialize(prFolder, pr.repository().url(),
+                                                    "+" + pr.targetRef() + ":submit_" + pr.repository().name());
              var headHash = localRepo.fetch(pr.repository().url(), pr.headHash().hex());
  
              var checkBuilder = CheckBuilder.create(executor.checkName(), headHash);
              pr.createCheck(checkBuilder.build());