Add post-deploy workflow to notify search engines

[Copilot]

After each successful GitHub Pages deployment, search engines should be notified to crawl updated content. Adds a notify-search-engines workflow triggered on pages-build-deployment success.

Changes

• .github/workflows/notify-search-engines.yml — new workflow with:
  • workflow_run trigger scoped to pages-build-deployment completions, conditional on success
  • Google Indexing API notification via robingenz/google-indexing-action@v1.0.2 (GCP_SERVICE_ACCOUNT_JSON secret)
  • IndexNow submission (Bing, DuckDuckGo, Yandex) via bojieyang/indexnow-action@v2.1.0 against the published sitemap (INDEXNOW_KEY secret)
  • permissions: {} — no GITHUB_TOKEN access needed
  • Actions pinned to specific version tags instead of mutable refs (@main, @v2)

Required Secrets

Secret	Used by
GCP_SERVICE_ACCOUNT_JSON	Google Indexing API
INDEXNOW_KEY	Bing / DuckDuckGo / Yandex via IndexNow

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add post step to update search engines</issue_title>
<issue_description>Post docs new publish google search and bing and perhaps other search engines should be notified.

E.g.

# Google Indexing
      - name: Notify Google
        uses: robingenz/google-indexing-action@main
        with:
          siteUrl: 'https://docs.falkordb.com'
          gcpServiceAccountKey: ${{ secrets.GCP_SERVICE_ACCOUNT_JSON }}

      # Bing + DuckDuckGo + Yandex via IndexNow
      - name: Notify Bing (IndexNow)
        uses: bojieyang/indexnow-action@v2
        with:
          sitemap-location: 'https://docs.falkordb.com/sitemap.xml'
          key: ${{ secrets.INDEXNOW_KEY }}

      # Generate IndexNow key file during build
      # (add this BEFORE your pages deploy step)
      # - name: Setup IndexNow key file
      #   run: echo "${{ secrets.INDEXNOW_KEY }}" > ./site/${{ secrets.INDEXNOW_KEY }}.txt
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Add post step to update search engines #390

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