refine document upload (#602)

### What problem does this PR solve?

#567 

### Type of change

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

docker/entrypoint.sh

@@ -34,6 +34,7 @@ do
   task_exe $i $WS &
 done
 
+while [ 1 -eq 1 ];do
 $PY api/ragflow_server.py
-
+done
 wait;