allowing docker container to access service on host (#2895)

### What problem does this PR solve?

1. services running (e.g., ollama) running on the host could not be
accessed from docker containers

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

---------

Co-authored-by: Zhichang Yu <[email protected]>

docker/docker-compose.yml

@@ -29,3 +29,5 @@ services:
     networks:
       - ragflow
     restart: always
+    extra_hosts:
+      - "host.docker.internal:host-gateway"