add tsinghua pypi mirror

Dockerfile

@@ -5,7 +5,7 @@ FROM python:3.10 as requirements-stage
 WORKDIR /tmp
 
 #
-RUN pip install poetry
+RUN pip install poetry -i https://pypi.tuna.tsinghua.edu.cn/simple
 
 #
 COPY ./pyproject.toml ./poetry.lock* /tmp/