Publish both generic k8s and openshift manifests for each release

as per !204 (comment 658034648) - we've got 2 distinct artifacts: one for generic k8s and one for OpenShift that differ enough to warrant separate releases.

Things to cover:

• we may need to refactor kustomize directories to have distinct layers:

  1. generic k8s
  2. openshift overlay (over generic k8s)
  3. kustomize(d) assembly of (1)+(2) for the sake of producing singular artifact for OpenShift

• We'll have to refactor publishing process to incorporate additional item