Merge branch 'earndt-dockerfile-modifications' into 'dev'

[AFP-108] ✨ Edits Dockerfile to create deployable OMS image [@earndt]

See merge request !15

Dockerfile

-FROM openjdk:8-alpine
-VOLUME /tmp
-ADD ./backend/order-management/target/orders.jar orders.jar
-ENTRYPOINT ["java","-jar","/orders.jar"]
+FROM maven:3.6.0-jdk-11-slim AS build
+COPY src /home/app/src
+COPY pom.xml /home/app
+RUN mvn -f /home/app/pom.xml clean package -DskipTests
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+
+FROM openjdk:11-jre-slim
+COPY --from=build /home/app/target/order-management-0.0.1-SNAPSHOT.jar /usr/local/lib/order-management.jar
+EXPOSE 8080
+ENTRYPOINT ["java","-jar","/usr/local/lib/order-management.jar"]
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