Installable KMS Helm chart

[jackfrancis]

Describe the request

It would be great to encapsulate all of the bootstrap + application install functionality into a canonical helm chart that any self-managed Kubernetes + Azure environment could consume to make their cluster kms-capable.

We should integrate the above using github actions so we can publish the chart in a repo tightly coupled to this project.

Explain why KMS Plugin for Key Vault needs it

Make testing more generic across the variety of k8s + Azure flavors.

Describe the solution you'd like

Describe alternatives you've considered

Additional context