gha: Update Gateway API Conformance test

This commit is to update GHA Gateway API conformance test as per below:

- Use experimental CRDs mainly for running tests for all features.
- Remove -debug flag as it's too verbose.
- Limit number of concurrency test from default (e.g. 8) to 4 to minimize
  overlapping between the tests.
- Enable GatewayClassObservedGenerationBump feature.

Signed-off-by: Tam Mach <tam.mach@cilium.io>

.github/workflows/conformance-gateway-api.yaml

@@ -94,10 +94,10 @@ jobs:
       - name: Install Gateway API CRDs
         run: |
           # Install Gateway CRDs
-          kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/gateway-api/${{ env.gateway_api_version }}/config/crd/standard/gateway.networking.k8s.io_gatewayclasses.yaml
-          kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/gateway-api/${{ env.gateway_api_version }}/config/crd/standard/gateway.networking.k8s.io_gateways.yaml
-          kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/gateway-api/${{ env.gateway_api_version }}/config/crd/standard/gateway.networking.k8s.io_httproutes.yaml
-          kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/gateway-api/${{ env.gateway_api_version }}/config/crd/standard/gateway.networking.k8s.io_referencegrants.yaml
+          kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/gateway-api/${{ env.gateway_api_version }}/config/crd/experimental/gateway.networking.k8s.io_gatewayclasses.yaml
+          kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/gateway-api/${{ env.gateway_api_version }}/config/crd/experimental/gateway.networking.k8s.io_gateways.yaml
+          kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/gateway-api/${{ env.gateway_api_version }}/config/crd/experimental/gateway.networking.k8s.io_httproutes.yaml
+          kubectl apply -f https://raw.githubusercontent.com/kubernetes-sigs/gateway-api/${{ env.gateway_api_version }}/config/crd/experimental/gateway.networking.k8s.io_referencegrants.yaml
 
           # To make sure that Gateway API CRs are available
           kubectl wait --for condition=Established crd/gatewayclasses.gateway.networking.k8s.io --timeout=${{ env.timeout }}
@@ -135,10 +135,12 @@ jobs:
       - name: Run Gateway API conformance test
         timeout-minutes: 30
         run: |
-          GATEWAY_API_CONFORMANCE_TESTS=1 go test -v ./operator/pkg/gateway-api \
+          GATEWAY_API_CONFORMANCE_TESTS=1 go test \
+            -p 4 \
+            -v ./operator/pkg/gateway-api \
             --gateway-class cilium \
-            --supported-features ReferenceGrant,TLSRoute,HTTPRouteQueryParamMatching,HTTPRouteMethodMatching,RouteDestinationPortMatching \
-            --debug -test.run "TestConformance"
+            --supported-features ReferenceGrant,TLSRoute,HTTPRouteQueryParamMatching,HTTPRouteMethodMatching,RouteDestinationPortMatching,GatewayClassObservedGenerationBump \
+            -test.run "TestConformance"
 
       - name: Post-test information gathering
         if: ${{ !success() }}

operator/pkg/gateway-api/conformance_test.go

@@ -28,14 +28,14 @@ import (
 //
 //	GATEWAY_API_CONFORMANCE_TESTS=1 go test -v ./operator/pkg/gateway-api \
 //		--gateway-class cilium \
-//		--supported-features ReferenceGrant,TLSRoute,HTTPRouteQueryParamMatching,HTTPRouteMethodMatching,HTTPResponseHeaderModification,RouteDestinationPortMatching \
+//		--supported-features ReferenceGrant,TLSRoute,HTTPRouteQueryParamMatching,HTTPRouteMethodMatching,HTTPResponseHeaderModification,RouteDestinationPortMatching,GatewayClassObservedGenerationBump \
 //		--debug -test.run "TestConformance"
 //
 // You can also pass -test.run to run a specific test
 //
 //	GATEWAY_API_CONFORMANCE_TESTS=1 go test -v ./operator/pkg/gateway-api \
 //		--gateway-class cilium \
-//		--supported-features ReferenceGrant,TLSRoute,HTTPRouteQueryParamMatching,HTTPRouteMethodMatching,HTTPResponseHeaderModification,RouteDestinationPortMatching \
+//		--supported-features ReferenceGrant,TLSRoute,HTTPRouteQueryParamMatching,HTTPRouteMethodMatching,HTTPResponseHeaderModification,RouteDestinationPortMatching,GatewayClassObservedGenerationBump \
 //		--debug -test.run "TestConformance/HTTPRouteDisallowedKind"
 func TestConformance(t *testing.T) {
 	testutils.GatewayAPIConformanceTest(t)