Adding Dockerfile

Dockerfile

+# This file is a template, and might need editing before it works on your project.
+FROM openjdk:8-alpine
+
+ARG MAVEN_VERSION=3.5.0
+ARG USER_HOME_DIR="/root"
+ARG SHA=beb91419245395bd69a4a6edad5ca3ec1a8b64e41457672dc687c173a495f034
+ARG BASE_URL=https://apache.osuosl.org/maven/maven-3/${MAVEN_VERSION}/binaries
+
+RUN mkdir -p /usr/share/maven /usr/share/maven/ref \
+  && curl -fsSL -o /tmp/apache-maven.tar.gz ${BASE_URL}/apache-maven-$MAVEN_VERSION-bin.tar.gz \
+  && echo "${SHA}  /tmp/apache-maven.tar.gz" | sha256sum -c - \
+  && tar -xzf /tmp/apache-maven.tar.gz -C /usr/share/maven --strip-components=1 \
+  && rm -f /tmp/apache-maven.tar.gz \
+  && ln -s /usr/share/maven/bin/mvn /usr/bin/mvn
+  && apk update && apk add git
+
+ENV MAVEN_HOME /usr/share/maven
+ENV MAVEN_CONFIG "$USER_HOME_DIR/.m2"
+
+COPY mvn-entrypoint.sh /usr/local/bin/mvn-entrypoint.sh
+COPY settings-docker.xml /usr/share/maven/ref/
+
+VOLUME "$USER_HOME_DIR/.m2"
+
+ENTRYPOINT ["/usr/local/bin/mvn-entrypoint.sh"]
+CMD ["mvn"]