fix(neutron): Add a flag variable to enable designate integration in neutron (#449)

Co-authored-by: okozachenko1203 <okozachenko1203@users.noreply.github.com>
diff --git a/roles/neutron/tasks/main.yml b/roles/neutron/tasks/main.yml
index f37f6a5..397a64d 100644
--- a/roles/neutron/tasks/main.yml
+++ b/roles/neutron/tasks/main.yml
@@ -45,6 +45,11 @@
   ansible.builtin.set_fact:
     _neutron_helm_values: "{{ _neutron_helm_values | combine(__neutron_ovn_helm_values, recursive=True) }}"
 
+- name: Set external_dns_driver
+  ansible.builtin.set_fact:
+    _neutron_external_dns_driver: "designate"
+  when: neutron_designate_integration_enabled | bool
+
 - name: Deploy Helm chart
   run_once: true
   kubernetes.core.helm: