Update Dockerfile

FROM python:3.9-alpine

FROM python:alpine3.17

RUN echo "https://mirrors.sustech.edu.cn/alpine/v3.17/main" > /etc/apk/repositories

RUN echo "https://mirrors.sustech.edu.cn/alpine/v3.17/community" >> /etc/apk/repositories

RUN apk add --update --no-cache --virtual .build-deps \

        g++ \

        libxml2 \

        libxml2-dev && \

    apk add libxslt-dev

RUN pip3 config set global.index-url https://mirrors.sustech.edu.cn/pypi/simple

RUN pip3 install bandersnatch

CMD /bin/bash