add neutron plugin to the CI

Author: winiciusallan

.github/workflows/e2e.yaml

@@ -37,6 +37,8 @@ jobs:
         enable_workaround_docker_io: 'false'
         branch: ${{ matrix.openstack_version }}
         enabled_services: "openstack-cli-server,neutron-uplink-status-propagation"
+        conf_overrides: |
+            enable_plugin neutron https://opendev.org/openstack/neutron.git ${{ matrix.openstack_version }}
 
     - name: Deploy a Kind Cluster
       uses: helm/kind-action@92086f6be054225fa813e0a4b13787fc9088faab