[Meta] Chart Alpha Release

We have made significant progress on the Helm chart, and we will be ready to release an alpha version soon for customer testing.

The major items remaining:

• Storage persistence
• Documentation improvements
• kube-lego on by default, included in the chart, unless customer specifies own TLS secrets. (https://gitlab.com/charts/helm.gitlab.io/issues/155)
• Automatic generation of secrets, unless otherwise specified (https://gitlab.com/charts/helm.gitlab.io/issues/85)
• Helm install should complete before it times out, potentially solved by:
  • Reducing the size of GitLab containers
  • Allowing GKE to download more than one container at a time
  • etc.

Requirements for alpha release:

• GKE recommended, other k8s deployments may also work. If not, please open issues.
• Kubernetes 1.8+, we recommend 1.8.5.
• RBAC enabled
• We are working to bring Object Storage to CE in our March release in time for Alpha.

Features:

• SSL provided by Let's Encrypt, with optional manual certificates
• Internal Redis, Object Storage, Postgres (temporarily via Omnibus package)
• Support for external Redis, Postgres