feat: make cluster domain configurable in KEDA deployer

[Itx-Psycho0]

Problem

The external name service to the keda-add-ons-http-interceptor-proxy was hardcoded with the cluster domain set to cluster.local. This works for most cases, but fails in clusters with custom domain configurations.

Solution

Made the cluster domain configurable by adding a ClusterDomain field to the DeploySpec struct. The KEDA deployer now uses this field to build the interceptor proxy service URL, with cluster.local as the default fallback for backward compatibility.

Changes

• Added ClusterDomain field to DeploySpec in pkg/functions/function.go
• Updated interceptorBridgeService() in pkg/keda/deployer.go to use the configurable cluster domain
• Added unit tests in pkg/keda/deployer_test.go to verify the functionality

Usage

Users can now configure the cluster domain in their func.yaml:

deploy:
  deployer: keda
  clusterDomain: "custom.domain"  # Optional, defaults to "cluster.local"

Testing
✅ All unit tests pass
✅ Linting checks pass
✅ Backward compatible (defaults to "cluster.local")
Fixes #3403

[knative-prow]

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[knative-prow]

Hi @Itx-Psycho0. Thanks for your PR.

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[Itx-Psycho0]

Hi maintainers,

I've implemented a fix for issue #3403 that makes the cluster domain configurable in the KEDA deployer.

Summary:

• Added a ClusterDomain field to DeploySpec that allows users to configure the cluster domain
• Updated the KEDA deployer to use this field when building the interceptor proxy service URL
• Defaults to "cluster.local" for backward compatibility
• Added comprehensive unit tests

The implementation is backward compatible and follows the existing patterns in the codebase. All tests pass and linting is clean.

I'd appreciate your review when you have a chance.

@lkingland @creydr @matejvasek

Thanks!