update prow script to enable primary ipv6 address (#3510)

* update prow script to enable primary ipv6 address

* modify existing ENI to enable primary ipv6 instead of creating new ones

scripts/run-e2e-test.sh

@@ -155,6 +155,14 @@ function install_controller_for_adc_regions() {
     kubectl apply -f $ingclass_yaml || true
 }
 
+function enable_primary_ipv6_address() {
+  echo "enable primary ipv6 address for the ec2 instance"
+  ENI_IDS=$(aws ec2 describe-instances --filters "Name=tag:aws:eks:cluster-name,Values=$CLUSTER_NAME" --query "Reservations[].Instances[].NetworkInterfaces[].NetworkInterfaceId" --output text)
+  for ENI_ID in $ENI_IDS; do
+    aws ec2 modify-network-interface-attribute --network-interface-id $ENI_ID --enable-primary-ipv6 || true
+  done
+}
+
 echo "installing AWS load balancer controller"
 if [[ $ADC_REGIONS == *"$REGION"* ]]; then
   echo "for ADC regions, install via manifest"
@@ -214,6 +222,9 @@ function run_ginkgo_test() {
 }
 
 #Start the test
+if [ "$IP_FAMILY" == "IPv6" ]; then
+  enable_primary_ipv6_address
+fi
 run_ginkgo_test
 
 # tail=-1 is added so that no logs are truncated