don't use artifacts on manual runs

Author: ben-c-at-moz

.github/workflows/smoke.yml

@@ -281,6 +281,7 @@ jobs:
           exit $TEST_EXIT_CODE
 
   Use-Artifacts:
+    if: ${{ github.event_name != 'workflow_dispatch' }}
     runs-on: ubuntu-latest
     needs:
       - Smoke-Windows