update requirements.txt

Dockerfile

@@ -16,7 +16,7 @@ RUN apt-get update && apt-get install -y curl gnupg ca-certificates \
     && rm -rf /var/lib/apt/lists/*
 
 COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt -i https://mirrors.aliyun.com/pypi/simple
 
 COPY . .