cert-manager
https://docs.cert-manager.io/en/latest/
https://discourse.jupyter.org/t/wip-documentation-about-cert-manager/2068
Kubernetes ingress
https://kubernetes.io/docs/concepts/services-networking/ingress/
Let’s Encrypt
https://letsencrypt.org/
nginx-ingress
https://github.com/helm/charts/tree/master/stable/nginx-ingress