ci: install ripgrep for complete example verification

Author: Philip Z

.github/workflows/example-gate.yml

@@ -9,6 +9,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - name: Install example verification tools
+        run: sudo apt-get update && sudo apt-get install -y ripgrep
       - uses: actions/setup-python@v5
         with:
           python-version: '3.10'