Added Dockerfile that builds DataHelix inside its own dockerfile envi…

…ronment and generates a docker container that only contains the fatJar executable and the Java 8 JRE.

Dockerfile

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+FROM openjdk:8u212-jdk-stretch AS build
+
+WORKDIR /root
+
+ENV GRADLE_HOME /opt/gradle
+ENV GRADLE_VERSION 5.4.1
+
+RUN wget --no-verbose --output-document=gradle.zip "https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-bin.zip"
+RUN unzip gradle.zip
+RUN rm gradle.zip
+RUN mv "gradle-${GRADLE_VERSION}" "${GRADLE_HOME}/"
+RUN ln --symbolic "${GRADLE_HOME}/bin/gradle" /usr/bin/gradle
+
+COPY . /root/
+
+RUN gradle fatJar
+
+FROM openjdk:8u212-jre-alpine
+
+WORKDIR /root
+COPY --from=build /root/orchestrator/build/libs/generator.jar .
+
+ENTRYPOINT ["java", "-jar", "generator.jar"]

docker-build.sh

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+#! /bin/bash
+
+docker build . --tag "datahelix"