chore: Add tests for the Kata Containers extension

Let's add a very basic test for the Kata Containers extension, mimicing
what's already in place for gVisor.

This depends on the work being done in:
siderolabs/extensions#279

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

internal/integration/api/extensions_qemu.go

@@ -395,6 +395,39 @@ func (suite *ExtensionsSuiteQEMU) TestExtensionsGvisor() {
 	suite.Require().NoError(suite.WaitForPodToBeRunning(suite.ctx, 5*time.Minute, "default", "nginx-gvisor"))
 }
 
+// TestExtensionsKataContainers verifies gvisor runtime class is working.
+func (suite *ExtensionsSuiteQEMU) TestExtensionsKataContainers() {
+	_, err := suite.Clientset.NodeV1().RuntimeClasses().Create(suite.ctx, &nodev1.RuntimeClass{
+		ObjectMeta: metav1.ObjectMeta{
+			Name: "kata",
+		},
+		Handler: "kata",
+	}, metav1.CreateOptions{})
+	defer suite.Clientset.NodeV1().RuntimeClasses().Delete(suite.ctx, "kata", metav1.DeleteOptions{}) //nolint:errcheck
+
+	suite.Require().NoError(err)
+
+	_, err = suite.Clientset.CoreV1().Pods("default").Create(suite.ctx, &corev1.Pod{
+		ObjectMeta: metav1.ObjectMeta{
+			Name: "nginx-kata",
+		},
+		Spec: corev1.PodSpec{
+			Containers: []corev1.Container{
+				{
+					Name:  "nginx-kata",
+					Image: "nginx",
+				},
+			},
+		},
+	}, metav1.CreateOptions{})
+	defer suite.Clientset.CoreV1().Pods("default").Delete(suite.ctx, "nginx-kata", metav1.DeleteOptions{}) //nolint:errcheck
+
+	suite.Require().NoError(err)
+
+	// wait for the pod to be ready
+	suite.Require().NoError(suite.WaitForPodToBeRunning(suite.ctx, 5*time.Minute, "default", "nginx-gvisor"))
+}
+
 // TestExtensionsStargz verifies stargz snapshotter.
 func (suite *ExtensionsSuiteQEMU) TestExtensionsStargz() {
 	_, err := suite.Clientset.CoreV1().Pods("default").Create(suite.ctx, &corev1.Pod{