Support optional annotations on Secret and Deployment resources

[isindir]

Is your feature request related to a problem? Please describe.

Currently the Helm chart does not allow users to add custom annotations to the resulting Secret and Deployment manifests that get rendered during installation/upgrade.
Annotations are useful for integrating with tools like stakater/reloader which watch annotated resources and trigger rollouts when they change (e.g., reload certs on secret update). Without this capability, users must patch manifests post-render or restart deployment manually.

Describe the solution you'd like

Add optional configuration in values.yaml to let consumers specify arbitrary annotations for:

• the generated Certificate Secret
• the Deployment resource

For example:

deploymentAnnotations:
  reloader.stakater.com/search: "true"

secretAnnotations:
  reloader.stakater.com/match: "true"

The chart templates should include the provided annotations under metadata.annotations for each resource only when defined.

Describe alternatives you've considered

• Using a post-renderer tool or kustomize overlay — adds complexity and extra tooling.
• Forking the chart and maintaining custom templates — creates maintenance overhead.
• Rely on external automation (e.g., ArgoCD ApplicationSet annotations) — doesn’t cover all use cases and depends on the delivery tool.

Additional context

This change would make it easier to support auto-reload patterns (like stakater/reloader) and other annotation-based tooling without requiring users to manipulate the rendered output or maintain chart forks.

PR for this is ready for review: #25

[isindir]

Please review this.