Fix dummy files for driver failure artifact (#1833)

Author: Stringy

.github/workflows/cpaas-sync-drivers.yml

@@ -79,7 +79,8 @@ jobs:
 
           # This empty file is needed for the failure artifact to be
           # created when there are no failures
-          touch "${TMP_DIR}/FAILURES/.dummy"
+          # Must not be a hidden file or upload-artifact/merge will ignore it
+          touch "${TMP_DIR}/FAILURES/dummy"
 
       - name: Upload failure logs
         uses: actions/upload-artifact@v4