helm chart addition features

[alexinthesky]

annotation on service ( for topology aware routing )

[Copilot]

Pull Request Overview

This PR adds support for service annotations in the GitHub Actions cache server Helm chart to enable topology aware routing configuration.

• Adds a configurable annotations field to the service configuration in values.yaml
• Updates the service template to conditionally render annotations when provided

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
install/kubernetes/github-actions-cache-server/values.yaml	Adds default empty annotations configuration for the service
install/kubernetes/github-actions-cache-server/templates/service.yaml	Implements conditional rendering of service annotations from values

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