sudo tee /var/www/polinag.dev/sitemap.xml >/dev/null <<'XML'
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url>
    <loc>https://polinag.dev/</loc>
    <changefreq>weekly</changefreq>
    <priority>1.0</priority>
  </url>
</urlset>
XML