Update .github/workflows/trigger-preview.yaml

Co-authored-by: Brian Rose <[email protected]>

Author: jukent

.github/workflows/trigger-preview.yaml

@@ -18,7 +18,6 @@ jobs:
       artifact_name: book-zip-${{ needs.find-pull-request.outputs.number }}
       destination_dir: _preview/${{ needs.find-pull-request.outputs.number }} # deploy to subdirectory labeled with PR number
       is_preview: "true"
-      publish_dir: 'portal/_build/html'
 
   preview-comment:
     needs: find-pull-request