Add gradio tests to workflow

Author: sd109

.github/workflows/test-pr.yml

@@ -44,6 +44,11 @@ jobs:
         with:
           ref: ${{ github.event.pull_request.head.sha }}
 
+      - name: Run Gradio app tests
+        run: |
+          ./test-images.sh $(git rev-parse --short ${{ github.event.pull_request.head.sha }})
+        working-directory: web-apps
+
       - name: Install Helm
         uses: azure/setup-helm@v4