feat(indexnow): add IndexNow key file and trigger script

.gitea/workflows/deploy.yml

@@ -9,6 +9,9 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
       - name: Install SSH client
         run: |
           apt-get update -qq
@@ -49,3 +52,11 @@ jobs:
           curl -fsS -o /dev/null -w "HEALTH HTTP %{http_code}\n" "$HEALTH_URL"
           docker image prune -af --filter "until=168h" >/dev/null 2>&1 || true
           REMOTE
+
+      - name: Setup Node.js for IndexNow
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+
+      - name: Notify IndexNow
+        run: npm run indexnow || true