Remove unused ssdb_data volume

docker/docker-compose.prod.yml

@@ -32,8 +32,6 @@ services:
   ssdb:
     image: tsl0922/ssdb
     container_name: ssdb_monolith
-    volumes:
-      - ssdb_data:/ssdb/var
     ports:
       - "1289:1289"
     environment:
@@ -44,5 +42,3 @@ networks:
       external:
          name: pathogen
 
-volumes:
-  ssdb_data: {}