Feature/add dns as helm chart

[klinch0]

Summary by CodeRabbit

• New Features

  • Introduced a .helmignore file to streamline Helm packaging by excluding unnecessary files.
  • Added a Chart.yaml for CoreDNS, providing essential metadata for deployment in Kubernetes.
  • Implemented a new HelmRelease configuration for managing CoreDNS deployment.
  • Defined a JSON schema for DNS forwarding parameters, enhancing configuration validation.
  • Added forward_params to allow custom DNS server settings in CoreDNS.
  • Introduced disabledDNSAddon parameter to control the CoreDNS addon state in Kubernetes.
  • Added comprehensive values.yaml file for extensive customization of CoreDNS deployment.
  • Implemented a ServiceMonitor for Prometheus integration to enhance observability of CoreDNS.

• Bug Fixes

  • Updated the Helm chart version from 0.9.0 to 0.10.0 to reflect recent improvements.

• Chores

  • Enhanced configurability of Kubernetes templates with conditional logic for DNS addon inclusion.