persistent storage for database

docker-compose.system.yaml

@@ -40,6 +40,8 @@ services:
       <<: *postgres_env
     networks:
       - dagster
+    volumes:
+      - /opt/dagster/db/:/var/lib/postgresql/data/
 
   # This service runs dagit, which loads your user code from the user code container.
   # Since our instance uses the QueuedRunCoordinator, any runs submitted from dagit will be put on