feat: add option to specify the clusterIP of OpenFGA service

[Khayet]

Adds the option to specify the ClusterIP of the OpenFGA service. This allows running OpenFGA as a "headless service" (see https://kubernetes.io/docs/concepts/services-networking/service/#headless-services).

What problem is being solved?

We want to run OpenFGA as a headless service, so we can do client-side load balancing of our gRPC connection (which requires discovering the IPs of the individual replicas).

How is it being solved?

Adds service.clusterIP entry to values.yaml and sets the service specification accordingly.

What changes are made to solve it?

• New clusterIP setting in values.yaml
• If clusterIP is set, the service specification uses it

References

• closes Add the option to run OpenFGA as a headless service #263

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above] -> no additional documentation necessary
• The correct base branch is being used, if not main
• [] I have added tests to validate that the change in functionality is working as expected -> I don't see where I would add an automated test but I have tested it locally.

Summary by CodeRabbit

• New Features
  • Service now supports configurable clusterIP; when unspecified, defaults to a headless Service (clusterIP: None) to improve compatibility with stateful/discovery setups.
• Chores
  • Minor YAML formatting cleanup for the HTTP port name with no functional impact.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Khayet / name: Jakob Herpel (2b57cfc, 782ca95)

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Walkthrough

Added optional Service clusterIP templating in Helm and set default service.clusterIP to None in values, making the Service headless. Minor port name formatting adjustment.

Changes

Cohort / File(s)	Summary
Service templating charts/openfga/templates/service.yaml	Add conditional `spec.clusterIP: {{ .Values.service.clusterIP
Chart values charts/openfga/values.yaml	Introduce service.clusterIP: None default to enable headless Service.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related issues

• Add the option to run OpenFGA as a headless service #263 — Implements headless Service support by adding service.clusterIP and defaulting to None.

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title clearly and succinctly describes the primary change of adding a configurable clusterIP option for the OpenFGA service, directly reflecting the modifications to values.yaml and the service template. It avoids unnecessary detail while remaining specific about the feature being introduced. This phrasing enables teammates to understand the pull request’s main intent at a glance.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

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Actionable comments posted: 1

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Reviewing files that changed from the base of the PR and between e693a7a and 2b57cfc.

📒 Files selected for processing (2)

• charts/openfga/templates/service.yaml (1 hunks)
• charts/openfga/values.yaml (1 hunks)

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• GitHub Check: lint-test

[Khayet]

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[HannesHerrmannAA]

Anything blocking for merging this and release a new version of the helm chart?
Perhaps @rhamzeh ?