Update deploy-preview.yml

Author: sserrata

.github/workflows/deploy-preview.yml

@@ -186,7 +186,7 @@ jobs:
           path: visual_diffs
 
       - name: Comment PR with results
-        if: github.event_name == 'pull_request'
+        if: github.event_name == 'pull_request' || github.event_name == 'pull_request_target'
         uses: actions/github-script@v7
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}