Update Dockerfile

Dockerfile

@@ -25,7 +25,7 @@ RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
                              openssl \
     && rm -rf /var/cache/apk/*
 
-RUN git clone https://github.com/whyour/qinglong /ql \
+RUN git clone https://ghproxy.com/https://github.com/whyour/qinglong /ql \
     && cd /ql \
     && git checkout --quiet master \
     && cp docker/docker-entrypoint.sh / \