container, service: Support reloading containers on template file change

roles/container/handlers/main.yaml

@@ -4,3 +4,9 @@
     systemd_restart_units: "{{ systemd_restart_units + [container_name ~ '.service'] }}" # noqa: var-naming[no-role-prefix]
   changed_when: true
   notify: Apply systemd unit restarts
+
+- name: Reload container service {{ container_name }}
+  ansible.builtin.systemd_service:
+    name: "{{ container_name }}.service"
+    state: reloaded
+  when: "container_name ~ '.service' not in systemd_restart_units"