Auto DevOps: Redeploying deleted app gives helm error

PROBLEM

For the review app delete step, the autodevops template is calling:

      helm delete "$name"

This leaves a ConfigMap around on the Kubernetes cluster after that review app instance is torn down and also makes it so you can't re-deploy the same branch again without a helm error:

Error: UPGRADE FAILED: "review-nginx-h7jpet" has no deployed releases

POTENTIAL SOLUTION

Use

      helm delete --purge "$name"

instead when shutting down review apps.