Added Tectonic to the page.
|# Installing GitLab on Kubernetes|
|> Officially supported cloud providers are Google Container Service and Azure Container Service.|
|> Officially supported schedulers are Kubernetes and Terraform.|
|> Officially supported schedulers are Kubernetes, Terraform and Tectonic.|
|The easiest method to deploy GitLab in [Kubernetes](https://kubernetes.io/) is|
|to take advantage of the official GitLab Helm charts. [Helm] is a package|