integrate IndexNow API for proactive search engine crawling

.github/workflows/deploy.yml

@@ -156,4 +156,10 @@ jobs:
         CLOUDFRONT_DISTRIBUTION_ID: ${{ secrets.CLOUDFRONT_DISTRIBUTION_ID }}
       run: |
         aws cloudfront create-invalidation --distribution-id $CLOUDFRONT_DISTRIBUTION_ID --paths "/*"
-        echo "CloudFront cache invalidation requested."
+        echo "CloudFront cache invalidation requested."
+
+    - name: Ping IndexNow
+      run: |
+        echo "Notifying Bing and other search engines via IndexNow..."
+        curl -s "https://api.indexnow.org/indexnow?url=https://pdflince.com&key=7a258aaa2a9b472bb6e97935fe5e82ca"
+        echo "IndexNow pinged successfully."

public/7a258aaa2a9b472bb6e97935fe5e82ca.txt

@@ -0,0 +1 @@
+7a258aaa2a9b472bb6e97935fe5e82ca

src/app/robots.ts

@@ -6,7 +6,9 @@ export const revalidate = false;
 export default function robots(): MetadataRoute.Robots {
     const baseUrl = "https://pdflince.com";
 
-    return {
+    // Cast to bypass Next.js restricted Sitemap type since it doesn't officially support 'host' yet
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const robotsObj: any = {
         rules: {
             userAgent: "*",
             allow: "/",
@@ -15,5 +17,8 @@ export default function robots(): MetadataRoute.Robots {
             ],
         },
         sitemap: `${baseUrl}/sitemap.xml`,
+        host: "https://api.indexnow.org/indexnow?url=https://pdflince.com&key=7a258aaa2a9b472bb6e97935fe5e82ca",
     };
+
+    return robotsObj as MetadataRoute.Robots;
 }