fix(ci): Install istioctl for Istio E2E tests

The Istio profile requires istioctl to install the Istio control plane.
Added installation step to CI workflow to ensure istioctl is available.

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 +57,12 @@ jobs:
         run: |
           curl https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash
 
+      - name: Install istioctl
+        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