We’re excited to announce that Ruby runtime on Google App Engine is going beta. Frameworks such as Ruby on Rails and Sinatra make it easy for developers to rapidly build web applications and APIs for the cloud. App Engine provides an easy to use platform for developers to build, deploy, manage, and automatically scale services on Google’s infrastructure.

https://cloudplatform.googleblog.com/2016/05/Ruby-on-Google-App-Engine-goes-betaruntime.html