Check for BLOCKING_FAILURE string value

Author: hsubox76

.github/workflows/check-changeset.yml

@@ -61,5 +61,5 @@ jobs:
           - No changeset formatting errors detected.
     # Don't want it to throw before editing the comment.
     - name: Fail if checker script logged a blocking failure
-      if: ${{steps.check-changeset.outputs.BLOCKING_FAILURE}}
+      if: ${{steps.check-changeset.outputs.BLOCKING_FAILURE == 'true'}}
       run: exit 1