added a Dockerfile

Mustang-Server/Dockerfile

@@ -0,0 +1,37 @@
+# See https://docs.docker.com/engine/userguide/eng-image/multistage-build/
+# to build please run
+#  sudo docker build --tag mustang:2.0 . 
+# to start please run
+#  sudo docker run --publish 8080:8080 --detach --name mustang mustang:2.0
+# takes around 15s to start up, afterwards access http://127.0.0.1:8080
+# to remove please run
+#  sudo docker rm --force mustang
+
+FROM openjdk:8-jdk-alpine as builder
+WORKDIR /build
+RUN apk --no-cache add openjdk11 --repository=http://dl-cdn.alpinelinux.org/alpine/edge/community
+RUN apk --update add git maven
+RUN git clone https://github.com/ZUGFeRD/mustangproject.git
+RUN cd mustangproject && mvn clean package
+
+
+FROM openjdk:8-jre-alpine as runner
+
+ENV MUSTANG_VERSION=2.0.0-SNAPSHOT
+
+# Since this is a running network service we'll create an unprivileged account
+# which will be used to perform the rest of the work and run the actual service:
+
+# Debian:
+# RUN useradd --system --user-group --home-dir=/opt/mustang mustang
+# Alpine / Busybox:
+RUN install -d -o root -g root -m 755 /opt && adduser -h /opt/mustang -S mustang
+USER mustang
+WORKDIR /opt/mustang
+
+COPY --from=builder /build/mustangproject/Mustang-Server/target/Mustang-Server-${MUSTANG_VERSION}.jar /opt/mustang/
+COPY --from=builder /build/mustangproject/Mustang-Server/config.yml /opt/mustang/
+COPY --from=builder /build/mustangproject/Mustang-Server/dwstart.keystore /opt/mustang/
+
+EXPOSE 8080
+ENTRYPOINT java -jar /opt/mustang/Mustang-Server-${MUSTANG_VERSION}.jar server config.yml