diff --git a/.github/workflows/preview.yml b/.github/workflows/preview.yml
index 0bb3aa2be68..9dd4f85fbd0 100644
--- a/.github/workflows/preview.yml
+++ b/.github/workflows/preview.yml
@@ -44,6 +44,11 @@ jobs:
             const fs = require('fs');
             fs.writeFileSync('${{ github.workspace }}/out.zip', Buffer.from(download.data));
       - run: unzip -o out.zip -d out
+      - name: 'debug info'
+        uses: actions/github-script@v3.1.0
+        with:
+          script: |
+            console.log(${{ toJson(github.event) }});
       - run: node scripts/publish-preview
         env:
           CI_PREVIEW_TOKEN: ${{ secrets.CI_PREVIEW_TOKEN }}