try fromJSON

Author: jsji

.github/workflows/sycl-detect-changes.yml

@@ -28,7 +28,7 @@ jobs:
 
       - name: Check file changes
         uses: dorny/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36
-        if: ${{ steps.changed_files.outputs.changed_files }} < 500
+        if: ${{ fromJSON(steps.changed_files.outputs.changed_files) }} < 500
         id: changes
         with:
           filters: |