Add env to expose minio port to the host (#426)

### What problem does this PR solve?

The docker-compose file can't config minio related port by .env file. So
I just add env `MINIO_CONSOLE_PORT=9001
MINIO_PORT=9000` to .env file.

### Type of change

- [x] Refactoring

docker/.env

 MYSQL_PASSWORD=infini_rag_flow
 MYSQL_PORT=5455
 
+# Port to expose minio to the host
+MINIO_CONSOLE_PORT=9001
+MINIO_PORT=9000
+
 MINIO_USER=rag_flow
 MINIO_PASSWORD=infini_rag_flow
 

docker/docker-compose-base.yml

     container_name: ragflow-minio
     command: server --console-address ":9001" /data
     ports:
-      - 9000:9000
-      - 9001:9001
+      - ${MINIO_PORT}:9000
+      - ${MINIO_CONSOLE_PORT}:9001
     environment:
       - MINIO_ROOT_USER=${MINIO_USER}
       - MINIO_ROOT_PASSWORD=${MINIO_PASSWORD}