Adding Dockerfile

Dockerfile

+FROM openjdk:8-alpine
+
+ARG ANT_VERSION=1.10.1
+ARG USER_HOME_DIR="/root"
+ARG SHA=0acf6f46a71985912f9c2c768795b97e5c26bc9a7a0b61d27af8287f8b96cd8e
+ARG BASE_URL=http://www-us.apache.org/dist//ant/binaries
+
+RUN mkdir -p /usr/share/ant /usr/share/ant/ref \
+  && apk update && apk add curl && apk add git && apk add bash \
+  && curl -fsSl -o /tmp/apache-ant.tar.gz ${BASE_URL}/apache-ant-$ANT_VERSION-bin.tar.gz \
+  && echo "${SHA}  /tmp/apache-ant.tar.gz" | sha256sum -c - \
+  && tar -xzf /tmp/apache-ant.tar.gz -C /usr/share/ant --strip-components=1 \
+  && rm -f /tmp/apache-ant.tar.gz \
+  && ln -s /usr/share/ant/bin/ant /usr/bin/ant
+
+ENV ANT_HOME /usr/share/ant
+
+COPY ant-entrypoint.sh /usr/local/bin/ant-entrypoint.sh
+
+ENTRYPOINT ["/usr/local/bin/ant-entrypoint.sh"]
+CMD ["ant"]