Add job for floating ip swap in staging env

.gitlab-ci.yml

@@ -111,7 +111,9 @@ staging-post-deploy:
     - openstack server add floating ip $instance_id $staging_floating_ip
     - openstack server delete $old_instance_id
     - openstack floating ip delete $instance_floating_ip
-
+  needs:
+    - job: tf-apply
+      artifacts: true
   rules:
     - if: '$TARGET_ENV == "staging"'