Error on staleness failure

.github/workflows/staleness_check.yml

@@ -50,6 +50,7 @@ jobs:
  # tests along with user changes. Any stale files will be automatically fixed in a follow-up
  # commit.
  run: |
+ set -ex
  if [[ -z $COMMIT_TRIGGERED_RUN || -z $MAIN_RUN ]]; then
  bazel query 'attr(tags, "staleness_test", //...)' | xargs bazel test $BAZEL_FLAGS || \
  echo "Please run ./regenerate_stale_files.sh to regenerate stale files"