To install tls secret you need.
helm repo add zifter https://zifter.github.io/helm-charts/
helm install tls-secret zifter/tls-secret --namespace kube-system -f values-prod.yaml
where values-domain.yaml is:
name: "my-wildcard-secret"
tls:
key: "YOU PUBLIC KEY"
crt: "YOU PRIVATE KEY"