feat(reports): add infrastructure to run istio conformance tests (#1102)

Basic usage:

```
  cd conformance/scripts/istio && \
    make setup-env-minikube run-tests readme-update INFERENCE_EXTENSION_VERSION=v0.5.0 ISTIO_VERSION=1.28
```

Output `conformance/reports/$version/$profile/$project' README and *-report.yaml.

Change includes reports for ISTIO_VERSION 1.28-alpha.32ca03082f566513ad9b860f31e7745b0f68dc91 and
INFERENCE_EXTENSION_VERSION v0.4.0 and v0.5.0

See conformance/scripts/istio/README for more details.

Author: aslakknutsen

conformance/reports/v0.4.0/gateway/istio/1.28-alpha.32ca03082f566513ad9b860f31e7745b0f68dc91-default-gateway-report.yaml

@@ -0,0 +1,23 @@
+GatewayAPIInferenceExtensionVersion: v0.4.0
+apiVersion: gateway.networking.k8s.io/v1
+date: "2025-07-23T14:20:45+02:00"
+gatewayAPIChannel: standard
+gatewayAPIVersion: v1.3.0
+implementation:
+  contact:
+  - '@istio/maintainers'
+  organization: istio
+  project: istio
+  url: https://istio.io
+  version: 1.28-alpha.32ca03082f566513ad9b860f31e7745b0f68dc91
+kind: ConformanceReport
+mode: default
+profiles:
+- core:
+    result: success
+    statistics:
+      Failed: 0
+      Passed: 9
+      Skipped: 0
+  name: Gateway
+  summary: Core tests succeeded.

conformance/reports/v0.4.0/gateway/istio/README.md

@@ -0,0 +1,21 @@
+# istio (gateway Profile Conformance) - v0.4.0
+
+## Test Results
+
+This directory contains conformance test results for Gateway API Inference Extension v0.4.0 testing against istio implementations using the gateway profile.
+
+| Extension Version Tested | Profile Tested | Implementation Version | Mode    | Report | Status |
+|--------------------------|----------------|------------------------|---------|--------|--------|
+| v1.3.0 | Gateway | 1.28-alpha.32ca03082f566513ad9b860f31e7745b0f68dc91 | default | [./1.28-alpha.32ca03082f566513ad9b860f31e7745b0f68dc91-default-gateway-report.yaml](././1.28-alpha.32ca03082f566513ad9b860f31e7745b0f68dc91-default-gateway-report.yaml) | PASS |
+## Running the Tests
+
+For instructions on how to reproduce these test results and run the conformance tests yourself, see the [istio Conformance Testing README](../../../../scripts/istio/README.md).
+
+## About This Version
+
+- **Extension Version**: v0.4.0
+- **Profile**: gateway
+- **Implementation**: istio
+- **Test Mode**: Default
+
+For detailed information about conformance testing, report generation, and requirements, see the [main conformance README](../../../../../README.md).

conformance/reports/v0.5.0/gateway/istio/1.28-alpha.32ca03082f566513ad9b860f31e7745b0f68dc91-default-gateway-report.yaml

@@ -0,0 +1,23 @@
+GatewayAPIInferenceExtensionVersion: v0.5.0
+apiVersion: gateway.networking.k8s.io/v1
+date: "2025-07-23T14:31:41+02:00"
+gatewayAPIChannel: standard
+gatewayAPIVersion: v1.3.0
+implementation:
+  contact:
+  - '@istio/maintainers'
+  organization: istio
+  project: istio
+  url: https://istio.io
+  version: 1.28-alpha.32ca03082f566513ad9b860f31e7745b0f68dc91
+kind: ConformanceReport
+mode: default
+profiles:
+- core:
+    result: success
+    statistics:
+      Failed: 0
+      Passed: 9
+      Skipped: 0
+  name: Gateway
+  summary: Core tests succeeded.

conformance/reports/v0.5.0/gateway/istio/README.md

@@ -0,0 +1,21 @@
+# istio (gateway Profile Conformance) - v0.5.0
+
+## Test Results
+
+This directory contains conformance test results for Gateway API Inference Extension v0.5.0 testing against istio implementations using the gateway profile.
+
+| Extension Version Tested | Profile Tested | Implementation Version | Mode    | Report | Status |
+|--------------------------|----------------|------------------------|---------|--------|--------|
+| v1.3.0 | Gateway | 1.28-alpha.32ca03082f566513ad9b860f31e7745b0f68dc91 | default | [./1.28-alpha.32ca03082f566513ad9b860f31e7745b0f68dc91-default-gateway-report.yaml](././1.28-alpha.32ca03082f566513ad9b860f31e7745b0f68dc91-default-gateway-report.yaml) | PASS |
+## Running the Tests
+
+For instructions on how to reproduce these test results and run the conformance tests yourself, see the [istio Conformance Testing README](../../../../scripts/istio/README.md).
+
+## About This Version
+
+- **Extension Version**: v0.5.0
+- **Profile**: gateway
+- **Implementation**: istio
+- **Test Mode**: Default
+
+For detailed information about conformance testing, report generation, and requirements, see the [main conformance README](../../../../../README.md).