Add GCP link to June 2025 blog post

Author: tokifyi

blog/2025-07-10-june-product-updates.md

@@ -63,6 +63,7 @@ You can now try out the Ask Defang chatbot directly within Intercom! This new in
 
 And one more thing: bridging local development and cloud deployment just got easier. We’ve published white papers on how Defang extends Docker Compose and GCP workflows to the cloud — using familiar tools at scale. An AWS white paper is coming soon.
 👉 [Read the white paper here](https://defang.io/whitepapers/docker-compose-defang/)
+👉 [Read the GCP white paper](https://defang.io/whitepapers/gcp-defang/)
 
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