service: lint and add missing argspec elements specs

roles/service/meta/argument_specs.yaml

@@ -13,6 +13,7 @@ argument_specs:
         type: list
         required: false
         default: []
+        elements: str
       service_container_http_port:
         description:
           - Port inside the container where http requests will be proxied to.
@@ -29,6 +30,7 @@ argument_specs:
         type: list
         required: false
         default: []
+        elements: str
       service_container_mounts:
         description: List of bind mounts or volumes to be mounted inside the service container(s).
         type: list
@@ -125,6 +127,7 @@ argument_specs:
             type: list
             required: false
             default: []
+            elements: str
           env:
             description: A dict of environment variables for the container
             type: dict

roles/service/tasks/mounts.yaml

@@ -6,7 +6,7 @@
 - name: Set container named mounts
   ansible.builtin.set_fact:
     _service_container_mounts: >
-      {{ _service_container_mounts + 
+      {{ _service_container_mounts +
       [mount | combine({'source': service_name + '-' + mount.source})] }}
   when: mount.type == 'volume'
   loop: "{{ service_container_mounts }}"