Add back error message unconditionally

.github/workflows/staleness_check.yml

@@ -55,6 +55,7 @@ jobs:
           bazel-cache: staleness
           bash: >
             set -ex;
+            echo "Please run ./regenerate_stale_files.sh to regenerate stale files";
             if [[ -z $COMMIT_TRIGGERED_RUN || -z $MAIN_RUN ]]; then
             bazel query 'attr(tags, "staleness_test", //...)' | xargs bazel test $BAZEL_FLAGS;
             else