refactor(posts): add "How to generate Google Cloud identity token"

Post: 2026-02-24-how-to-generate-google-cloud-identity-token.md

Author: remarkablemark

_posts/2026/2026-02-24-how-to-generate-google-cloud-identity-token.md

@@ -65,8 +65,15 @@ The output should look like:
 }
 ```
 
-To get just the ID token:
+To get just ID token from the headers:
 
 ```js
 console.log(headers.Authorization.split(' ')[1]);
 ```
+
+Or simply fetch the token:
+
+```js
+const token = await client.idTokenProvider.fetchIdToken(targetAudience);
+console.log(token);
+```