Add multistage docker build

docker/multistage/Dockerfile

@@ -0,0 +1,23 @@
+FROM centos:centos7 as builder
+RUN yum -y install epel-release java-1.8.0-openjdk-devel
+RUN yum -y groupinstall 'Development Tools'
+RUN yum -y install git maven
+RUN git clone https://github.com/rasilon/ujetl.git
+RUN cd ujetl && mvn package
+
+
+
+
+FROM centos:centos7
+MAINTAINER Derry Hamilton <derryh@rasilon.net>
+
+RUN yum -y install epel-release
+RUN yum -y install java-1.8.0-openjdk-devel
+
+RUN mkdir -p /usr/share/ujetl/lib/ /var/ujetl /etc/ujetl
+
+COPY --from=builder  /ujetl/target/CopyingApp-2.*-jar-with-dependencies.jar /usr/share/ujetl/lib/CopyingApp.jar
+COPY --from=builder  /ujetl/install_extra/copying_defaults_log4j.xml /etc/ujetl/
+COPY ujetl_entrypoint /
+ENTRYPOINT ["/ujetl_entrypoint"]
+

docker/multistage/ujetl_entrypoint

@@ -0,0 +1,17 @@
+#!/bin/bash
+set -e
+
+LOG_PROPS=/etc/ujetl/copying_defaults_log4j.xml
+
+cd /var/ujetl
+for file in *.xml
+do
+	/usr/bin/java \
+		-Xms1g \
+		-Xmx2g   \
+		-cp /usr/share/ujetl/lib/CopyingApp.jar \
+		com.rasilon.ujetl.CopyingApp \
+		--log4j "$LOG_PROPS" \
+		--config "$file"
+done
+