docker 构建jenkins镜像

FROM jenkins/jenkins:lts
RUN sed -i 's#https://updates.jenkins.io/update-center.json#https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/update-center.json#g' /var/jenkins_home/hudson.model.UpdateCenter.xml
RUN echo "<?xml version='1.1' encoding='UTF-8'?>" > /var/jenkins_home/hudson.model.UpdateCenter.xml
RUN echo "<sites>"  > /var/jenkins_home/hudson.model.UpdateCenter.xml
RUN echo "  <site>" > /var/jenkins_home/hudson.model.UpdateCenter.xml
RUN echo "    <id>default</id>" > /var/jenkins_home/hudson.model.UpdateCenter.xml
RUN echo "    <url>https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/update-center.json</url>" > /var/jenkins_home/hudson.model.UpdateCenter.xml
RUN echo "  </site>" > /var/jenkins_home/hudson.model.UpdateCenter.xml
RUN echo "</sites>" > /var/jenkins_home/hudson.model.UpdateCenter.xml