chore: add dnsPolicy and dnsConfig support to pod template

[andibeuge]

This adds support for dnsConfig

[Copilot]

Pull request overview

Adds configurable dnsPolicy and dnsConfig support to the shared pod template used across the Helm charts, allowing consumers to customize pod DNS behavior via values.

Changes:

• Document dnsPolicy / dnsConfig configuration options in chart values.yaml files.
• Render spec.dnsPolicy and spec.dnsConfig in the shared common.pod template, with support for global defaults and per-pod overrides.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
parcellab/worker-group/values.yaml	Adds commented examples/docs for dnsPolicy and dnsConfig in worker-group chart values.
parcellab/monolith/values.yaml	Adds commented examples/docs for dnsPolicy and dnsConfig in monolith chart values.
parcellab/microservice/values.yaml	Adds commented examples/docs for dnsPolicy and dnsConfig in microservice chart values.
parcellab/cronjob/values.yaml	Adds commented example configuration for dnsPolicy and dnsConfig in cronjob chart values.
parcellab/common/values.yaml	Documents the new global values supported by the shared pod template.
parcellab/common/templates/_pod.tpl	Implements rendering of dnsPolicy/dnsConfig into PodSpec, with .pod.* overriding .Values.*.