Create Helm chart for the ZLUX app server

[markjhollands]

Create an additional Helm chart for the ZLUX app server.

A proposed structure will be:

• 2 x PersistentVolumeClaim resources for the instance and dropins volumes
• Job resource template for plugin extraction jobs
• Deployment resource for the ZLUX app server container. This may also include an initContainer to install the plugins before the main app server container starts
• Service (ClusterIP) resource for exposing port 8544 (or other configured port) to the cluster
• ServiceAccount resource to allow the app server to run under a service account which is not default