Move chinese mirrors to another file

Dockerfile

@@ -1,12 +1,9 @@
 FROM ubuntu:latest
-RUN sed -i s/http:\\/\\/archive.ubuntu.com/http:\\/\\/mirrors.aliyun.com/g /etc/apt/sources.list && sed -i s/http:\\/\\/security.ubuntu.com/http:\\/\\/mirrors.aliyun.com/g /etc/apt/sources.list
 RUN apt-get update -y
 RUN apt-get install libboost-filesystem-dev build-essential curl -y
 RUN apt-get install npm p7zip-full redis-server rabbitmq-server mysql-client -y
-RUN npm set registry https://registry.npm.taobao.org
 RUN npm install -g n
 RUN n lts
-RUN npm install -g npm@5.6.0
 RUN mkdir /var/syzoj && mkdir /mnt/syzoj-bin && mkdir /etc/syzoj-config && mkdir /mnt/syzoj-tmp1 && mkdir /mnt/syzoj-tmp2 && mkdir /mnt/syzoj-data
 ADD syzoj.tar.xz /var/syzoj/syzoj/
 ADD judge-v3.tar.xz /var/syzoj/judge-v3/

Dockerfile-china

@@ -0,0 +1,23 @@
+FROM ubuntu:latest
+RUN sed -i s/http:\\/\\/archive.ubuntu.com/http:\\/\\/mirrors.aliyun.com/g /etc/apt/sources.list && sed -i s/http:\\/\\/security.ubuntu.com/http:\\/\\/mirrors.aliyun.com/g /etc/apt/sources.list
+RUN apt-get update -y
+RUN apt-get install libboost-filesystem-dev build-essential curl -y
+RUN apt-get install npm p7zip-full redis-server rabbitmq-server mysql-client -y
+RUN npm set registry https://registry.npm.taobao.org
+RUN npm install -g n
+RUN n lts
+RUN npm install -g npm@5.6.0
+RUN mkdir /var/syzoj && mkdir /mnt/syzoj-bin && mkdir /etc/syzoj-config && mkdir /mnt/syzoj-tmp1 && mkdir /mnt/syzoj-tmp2 && mkdir /mnt/syzoj-data
+ADD syzoj.tar.xz /var/syzoj/syzoj/
+ADD judge-v3.tar.xz /var/syzoj/judge-v3/
+WORKDIR /var/syzoj/syzoj
+RUN npm install
+WORKDIR /var/syzoj/judge-v3
+RUN npm install
+RUN npm install syspipe
+RUN npm run-script build
+ADD config/* /etc/syzoj-config/
+WORKDIR /root
+ADD scripts/* /root/
+EXPOSE 5283
+CMD ["/bin/bash", "/root/start.sh"]