service: Allow additional dependencies for additional containers

roles/service/meta/argument_specs.yaml

@@ -571,6 +571,23 @@ argument_specs:
                   the name of the environment variable. Defaults to secret name.
                 type: str
                 required: false
+          requires:
+            description: >-
+              List of systemd units this container depends on, in addition to
+              service-wide requires.
+            type: list
+            required: false
+            default: []
+            elements: str
+          wants:
+            description: >-
+              List of systemd units this container weakly depends on, in addition to
+              service-wide wants.
+            type: list
+            required: false
+            default: []
+            elements: str
+
 
       service_requires:
         description: List of systemd units this service container depends on.

roles/service/tasks/additional.yaml

@@ -16,7 +16,7 @@
     container_secrets: "{{ _service_additional_container_secrets }}"
     container_env: "{{ _service_additional_container.env }}"
     container_add_capabilities: "{{ _service_additional_container.add_capabilities }}"
-    container_requires: "{{ _service_container_requires }}"
+    container_requires: "{{ _service_additional_container_requires }}"
     container_wants: "{{ _service_additional_container_wants }}"
     container_auto_update: "{{ service_auto_update }}"
   loop: "{{ _service_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: >-
   {{
     [{