Jenkins 本身自带了 Java，而不带 Maven,所以重新做一个自带 Maven 的 Jenkins 镜像

cat >jenkins-dockerfile/Dockerfile <<EOF

FROM jenkinsci/jenkins

ADD apache-maven-3.5.4-bin.tar.gz /usr/local/
ENV  MAVEN_HOME=/usr/local/apache-maven-3.5.4
ENV  PATH=$JAVA_HOME/bin:$MAVEN_HOME/bin:$PATH
USER root

RUN apt-get update \
      && apt-get install -y sudo \
      && rm -rf /var/lib/apt/lists/*

RUN echo "jenkins ALL=NOPASSWD: ALL" >> /etc/sudoers
USER jenkins
EOF

参照：

https://huanqiang.wang/2018/03/30/Jenkins-Gitlab-Kubernetes-%E7%9A%84%E8%87%AA%E5%8A%A8%E5%8C%96%E6%8C%81%E7%BB%AD%E9%9B%86%E6%88%90%E4%B8%8E%E9%83%A8%E7%BD%B2/