[testing] E2E test case for VPC route controller (#280)

* Add the chainsaw test

* Address comment

Author: komer3

e2e/test/route-controller-test/chainsaw-test.yaml

@@ -0,0 +1,65 @@
+# yaml-language-server: $schema=https://raw.githubusercontent.com/kyverno/chainsaw/main/.schemas/json/test-chainsaw-v1alpha1.json
+apiVersion: chainsaw.kyverno.io/v1alpha1
+kind: Test
+metadata:
+  name: route-controller-test
+spec:
+  bindings:
+    - name: fwname
+      value: (join('-', ['ccm-fwtest', env('CLUSTER_NAME')]))
+  namespace: "route-controller-test"
+  steps:
+    - name: Check if CCM is deployed
+      try:
+        - assert:
+            file: ../assert-ccm-resources.yaml
+    - name: Check if the route controller updated the config for the linode
+      try:
+        - script:
+            content: |
+              set -e
+
+              if [ -z "$KUBECONFIG" ] || [ -z "$LINODE_TOKEN" ]; then
+                  echo "Error: KUBECONFIG and LINODE_TOKEN environment variables must be set"
+                  exit 1
+              fi
+
+              # Get all node names
+              nodes=$(kubectl get nodes -o jsonpath='{.items[*].metadata.name}')
+              if [ -z "$nodes" ]; then
+                  echo "Error: No nodes found in cluster"
+                  exit 1
+              fi
+
+              # Process each node
+              for node in $nodes; do
+                  echo "Checking node: $node"
+                  
+                  # Get pod CIDR and instance ID
+                  pod_cidr=$(kubectl get node "$node" -o jsonpath='{.spec.podCIDR}')
+                  instance_id=$(kubectl get node "$node" -o jsonpath='{.spec.providerID}' | sed 's/linode:\/\///')
+                  
+                  echo "  Pod CIDR: $pod_cidr"
+                  echo "  Instance ID: $instance_id"
+                  
+                  # Get interface details for this config
+                  interfaces=$(curl -s \
+                      -H "Authorization: Bearer $LINODE_TOKEN" \
+                      "https://api.linode.com/v4/linode/instances/$instance_id/configs" \
+                      | jq -r '.data[0].interfaces')
+                  
+                  # Check if pod CIDR is in the VPC interface IP ranges
+                  if echo "$interfaces" | jq -e --arg cidr "$pod_cidr" '.[] | select(.purpose == "vpc") | .ip_ranges[] | select(. == $cidr)' > /dev/null; then
+                      echo "Pod CIDR found in VPC interface configuration"
+                  else
+                      echo "Pod CIDR not found in VPC interface configuration"
+                      echo "Current VPC interface configuration:"
+                      echo "$interfaces" | jq '.[] | select(.purpose == "vpc")'
+                  fi
+                  
+                  echo "---"
+              done
+
+            check:
+              ($error == null): true
+              (contains($stdout, 'Pod CIDR not found in VPC interface configuration')): false