The following code works because there is a release that isn't considered a pre-release within the Helm chart repo.

helm template my-jupyterhub-release --repo https://jupyterhub.github.io/helm-chart/ jupyterhub

The same is not true for trying to install the jupyterhub-ssh Helm chart, then --version must be explicitly set as it won't assume you want to install the latest pre-release version. Due to that, we should probably cut a 0.1.0 release of this Helm chart.