fix(ci): Install istioctl conditionally for Istio profile

The Istio profile requires istioctl to install the Istio control plane.
Added conditional installation step that only runs for the istio profile,
avoiding unnecessary installation for ai-gateway and aibrix profiles.

Installs Istio 1.28.0 which is the version used by the Istio profile.

Signed-off-by: Asaad Balum <[email protected]>

Author: asaadbalum

.github/workflows/integration-test-k8s.yml

@@ -57,6 +57,13 @@ jobs:
         run: |
           curl https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash
 
+      - name: Install istioctl (for Istio profile)
+        if: matrix.profile == 'istio'
+        run: |
+          curl -L https://istio.io/downloadIstio | ISTIO_VERSION=1.28.0 sh -
+          sudo mv istio-1.28.0/bin/istioctl /usr/local/bin/
+          istioctl version --remote=false
+
       - name: Download E2E test dependencies
         run: |
           cd e2e && go mod download