Kubernetes Admission Webhook

Steps

1. Create a google cloud function to process the requests
   gcloud beta functions deploy addenvoy --trigger-http
2. Add MutatingWebhookConfiguration to your k8s cluster
   kubectl apply -f mutate.yaml
3. Create any new deployment to see envoy container automatically being added

References

https://github.com/kelseyhightower/denyenv-validating-admission-webhook