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This is a sample app for theRails 5.2 Credentials and Kubernetes post.

The interesting parts are:

• Dockerfile builds minimalistic Docker image with the app
• .dockerignore tells Docker to ignoreconfig/master.key
• script/release is a script for building and pushing Docker image
• config/deployment.yml is Kubernetes Deployment spec that uses Kubernetes secret management
• app/controllers/helloworld_controller.rb renders decrypted secrets as HTML

That's it!