Feature/infrastructure annotations support - ipam.vitistack.io/addresses

[haahaakon]

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[Copilot]

Pull request overview

This pull request adds end-to-end support for the ipam.vitistack.io/addresses infrastructure annotation, ensuring a consistent “addresses” value across HTTPRoute and its referred Gateway, and propagating the value into Gateway.Spec.Infrastructure.Annotations when creating gateways.

Changes:

• Introduces ValidateAddresses webhook validation to enforce that all routes attached to an existing Gateway either omit ipam.vitistack.io/addresses or use the exact same value as the Gateway.
• Extends the HTTPRoute controller flow to read ipam.vitistack.io/addresses and pass it into Gateway creation/validation logic.
• Adds unit tests covering the new addresses validation behavior.

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
internal/webhook/v1/validations/validations_test.go	Adds unit tests for ValidateAddresses covering match/mismatch and nil/missing annotation scenarios.
internal/webhook/v1/validations/validate_addresses.go	Implements ValidateAddresses and matching logic between HTTPRoute annotations and Gateway infrastructure annotations.
internal/webhook/v1/httproute_webhook.go	Hooks the new addresses validation into HTTPRoute create/update admission validation.
internal/controller/httproute_controller.go	Reads the addresses annotation from HTTPRoute and passes it into gateway ensure/create logic.
internal/controller/gateway_manager.go	Validates addresses consistency for existing gateways and propagates addresses into newly created gateway infrastructure annotations.
internal/annotations/gateway_annotations.go	Adds the AnnotationIPAMAddresses constant for ipam.vitistack.io/addresses.

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