service: Allow additional dependencies for additional containers

roles/service/vars/main/additional.yaml

@@ -1,7 +1,12 @@
 ---
+_service_additional_container_defaults:
+  image: "{{ service_container_image }}"
+  requires: []
+  wants: []
+
 _service_additional_containers_with_default_image: >-
   {{
-    ([{ 'image': service_container_image }] * service_additional_containers | length)
+    ([_service_additional_container_defaults] * service_additional_containers | length)
     | zip(service_additional_containers)
     | map('combine')
   }}
@@ -72,13 +77,16 @@ _service_additional_containers: >-
 
 _service_additional_container_wants: >-
   {{
-    service_wants
-    + _service_additional_container_publish_socket_ports
+    service_wants + _service_additional_container.wants +
+    _service_additional_container_publish_socket_ports
         | map(attribute='name')
         | map('regex_replace', '^', service_name ~ '-')
         | map('regex_replace', '$', '-socat.socket')
   }}
 
+_service_additional_container_requires: >-
+  {{ _service_container_requires + _service_additional_container.requires }}
+
 _service_additional_container_networks: >-
   {{
     [{