Add demo link for Alpine, Distroless or Scratch (GoogleCloudPlatform#3168)

Author: mathieu-benoit

README.md

@@ -140,6 +140,7 @@ Find **Protocol Buffers Descriptions** at the [`./protos` directory](/protos).
 
 ## Demos featuring Online Boutique
 
+- [alpine, distroless or scratch?](https://medium.com/google-cloud/alpine-distroless-or-scratch-caac35250e0b)
 - [Platform Engineering in action: Deploy the Online Boutique sample apps with Score and Humanitec](https://medium.com/p/d99101001e69)
 - [The new Kubernetes Gateway API with Istio and Anthos Service Mesh (ASM)](https://medium.com/p/9d64c7009cd)
 - [Use Azure Redis Cache with the Online Boutique sample on AKS](https://medium.com/p/981bd98b53f8)