service: Support additional networks for database

roles/service/meta/argument_specs.yaml

@@ -66,7 +66,9 @@ argument_specs:
         required: false
         default: ""
       service_container_additional_networks:
-        description: A list of additional podman networks for the service container (in addition to service name network).
+        description: >-
+          A list of additional podman networks for the service container (in
+          addition to service name network).
         type: list
         required: false
         default: []
@@ -212,6 +214,14 @@ argument_specs:
           - none
         required: false
         default: none
+      service_database_additional_networks:
+        description: >-
+          A list of additional podman networks for the database container (in
+          addition to service name network).
+        type: list
+        required: false
+        default: []
+        elements: str
       service_database_secret_type:
         description: Secret type for database secret for service container
         type: str