feat(dc): move postgres to external db

docker-compose.yml

@@ -20,25 +20,7 @@ services:
       - "traefik.http.services.spliit.loadbalancer.server.port=${DC_SPLIIT_PORT:?}"
     networks:
       - traefik
-      - spliit
-
-  db:
-    image: postgres:17.5@sha256:6efd0df010dc3cb40d5e33e3ef84acecc5e73161bd3df06029ee8698e5e12c60
-    environment:
-      - TZ=Europe/Zurich
-      - POSTGRES_DB=${DC_SPLIIT_POSTGRES_DB:-spliit}
-      - POSTGRES_USER=${DC_SPLIIT_POSTGRES_USER:-spliit}
-      - POSTGRES_PASSWORD=${DC_SPLIIT_POSTGRES_PASS:?}
-    volumes:
-      - postgres:/var/lib/postgresql/data
-    restart: always
-    networks:
-      - spliit
 
 networks:
   traefik:
     external: true
-  spliit:
-
-volumes:
-  postgres: