mcapi_proxy: ensure proxy service restarts when venv changes

Previously the service would only restart if the systemd unit
was modified. If the venv was changed in-place, this would not
trigger a restart.

Change-Id: I685bedef4d84bf718aaa9064a20d3c1b71daf5bf

mcapi_vexxhost/roles/proxy/handlers/main.yml

@@ -0,0 +1,24 @@
+---
+# Copyright 2024, BBC R&D
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+- name: Restart magnum_cluster_api_proxy service
+  systemd:
+    name: "magnum-cluster-api-proxy"
+    enabled: yes
+    state: "restarted"
+    daemon_reload: yes
+  listen:
+    - "venv changed"
+    - "systemd service changed"

mcapi_vexxhost/roles/proxy/tasks/main.yml

@@ -86,7 +86,6 @@
   vars:
     systemd_user_name: "{{ magnum_cluster_api_proxy_system_user_name }}"
     systemd_group_name: "{{ magnum_cluster_api_proxy_system_group_name }}"
-    systemd_service_restart_changed: true
     systemd_tempd_prefix: openstack
     systemd_slice_name: magnum-cluster-api-proxy
     systemd_lock_path: /var/lock/magnum-cluster-api-proxy