add hf_endpoint as env variable (#353)

### What problem does this PR solve?


Issue link:#350

### Type of change

- [x] Refactoring

docker/docker-compose-CN.yml

@@ -26,6 +26,7 @@ services:
       - ./nginx/nginx.conf:/etc/nginx/nginx.conf
     environment:
       - TZ=${TIMEZONE}
+      - HF_ENDPOINT=https://hf-mirror.co
     networks:
       - ragflow
     restart: always

docker/docker-compose.yml

@@ -25,6 +25,7 @@ services:
       - ./nginx/nginx.conf:/etc/nginx/nginx.conf
     environment:
       - TZ=${TIMEZONE}
+      - HF_ENDPOINT=https://huggingface.co
     networks:
       - ragflow
     restart: always