service: Support setting type and target for db password secret

roles/service/defaults/main.yaml

@@ -11,6 +11,8 @@ service_container_secrets: []
 service_container_env: {}
 
 service_database_type: none
+service_database_secret_type: mount
+service_database_secret_target: "{{ service_database_type }}"
 service_postgres_image: docker.io/library/postgres
 service_redis: false