Add interactive installer script (GAIE + BBR) under tools/installation

[mkoushni]

Goals

Adds an interactive installer script at tools/installation/install.sh that runs the full getting-started flow for the Gateway API Inference Extension (GAIE) with Body-Based Routing (BBR).

Flow

1. Prerequisites – Checks for kubectl, helm, kind, jq, curl
2. Cluster – Create a kind cluster or use an existing one
3. LoadBalancer – Optional MetalLB install (for kind)
4. Gateway API CRDs – Standard or Experimental, per Gateway API installing guide (required before Istio). Uses v1.2.1 and server-side apply for compatibility with older K8s
5. Model server – vLLM Simulator (no GPU)
6. Inference Extension CRDs – From latest GAIE release
7. Gateway controller – Istio with inference extension enabled
8. Inference Gateway – Deploy Istio gateway
9. InferencePool + EPP – Helm install from registry.k8s.io
10. Verify – HttpRoute and InferencePool status
11. InferenceObjective – Optional
12. Test – Sample completion request
13. BBR – Body-Based Routing (second pool, LoRA configmap, multi-pool routing)

References

• GAIE getting started
• Gateway API installation

Usage

sh
./tools/installation/install.sh # interactive install
./tools/installation/install.sh --dry-run # print commands only
./tools/installation/install.sh --cleanup # remove installed resources
./tools/installation/install.sh --help # help

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mkoushni
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[linux-foundation-easycla]

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• ✅ login: mkoushni / name: Marina Koushnir (4379f31)

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[k8s-ci-robot]

PR needs rebase.

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