add info where checksum was seen

.github/workflows/e2e_runtime-reproducibility.yml

@@ -91,6 +91,7 @@ jobs:
               checksum = pathlib.Path("./checksums", file).read_text()
               if not checksum in seen:
                   seen[checksum] = []
+              seen[checksum] = f"{file}"
           assert len(seen) > 0
           if len(seen) > 1:
               print("At least one checksum mismatched:")