add optional API Server ILB PR test

Author: nawazkh

config/jobs/kubernetes-sigs/cluster-api-provider-azure/cluster-api-provider-azure-presubmits-main.yaml

@@ -845,3 +845,44 @@ presubmits:
     annotations:
       testgrid-dashboards: sig-cluster-lifecycle-cluster-api-provider-azure
       testgrid-tab-name: capz-pr-scalability-100-node-k8s-main
+  - name: pull-cluster-api-provider-azure-apiserver-ilb
+    cluster: eks-prow-build-cluster
+    labels:
+      preset-dind-enabled: "true"
+      preset-kind-volume-mounts: "true"
+      preset-azure-community: "true"
+    decorate: true
+    optional: true
+    always_run: false
+    branches:
+      - ^main$
+    path_alias: sigs.k8s.io/cluster-api-provider-azure
+    extra_refs:
+      - org: kubernetes
+        repo: kubernetes
+        base_ref: master
+        path_alias: k8s.io/kubernetes
+    spec:
+      serviceAccountName: azure
+      containers:
+        - image: gcr.io/k8s-staging-test-infra/kubekins-e2e:v20241128-8df65c072f-1.29
+          args:
+            - runner.sh
+            - "./scripts/ci-e2e.sh"
+          env:
+            - name: GINKGO_FOCUS
+              value: "\\[API-Server-ILB\\]"
+          # we need privileged mode in order to do docker in docker
+          securityContext:
+            privileged: true
+          resources:
+            limits:
+              cpu: 4
+              memory: 9Gi
+            requests:
+              cpu: 4
+              memory: 9Gi
+    annotations:
+      testgrid-dashboards: sig-cluster-lifecycle-cluster-api-provider-azure
+      testgrid-tab-name: capz-pr-apiserver-ilb-main
+      description: This job creates a vanilla CAPZ cluster with an ILB for the API server and verifies that the cluster is functional.