added Dockerfile

Dockerfile

@@ -0,0 +1,57 @@
+FROM debian:stable
+
+MAINTAINER "Petter Nordlander"
+
+ARG LOCATION=/usr/local/a
+
+# Update the debian package catalog
+RUN apt-get update
+
+# Upgrade any existing package, typically security patches and tzdata
+RUN apt-get upgrade -y
+
+# Install maven
+# all further tools and libraries will be pulled by MVN
+# explicitly install default-jre-headless so that it will not be removed later
+RUN apt-get install -y maven default-jre-headless
+
+# Copy all required source code into the image
+RUN mkdir --parents ${LOCATION}/
+COPY pom.xml ${LOCATION}/
+COPY LICENSE ${LOCATION}/
+COPY README.md ${LOCATION}/
+COPY src ${LOCATION}/src
+
+# The default hostname is 'localhost'
+# But in a docker container that is still inside the container only
+# We need to replace 'localhost' with 'host.docker.internal'
+# and otherwise, user still needs to specify the alternative
+RUN sed --in-place \
+	-e 's/localhost:/host.docker.internal:/' \
+	${LOCATION}/src/main/java/co/nordlander/a/A.java
+
+# Build the A software in the usual way
+RUN cd /usr/local/a && mvn package -DskipTests
+
+# Create a new command that is always in the PATH
+RUN echo "#!/bin/sh" > /usr/bin/a && \
+	echo "java \
+		-Dnashorn.args=--no-deprecation-warning \
+		-cp ${LOCATION}/target/a-1.5.0-SNAPSHOT-jar-with-dependencies.jar \
+		co.nordlander.a.A \"\$@\"" >> /usr/bin/a && \
+	chmod a+rx /usr/bin/a
+RUN cat /usr/bin/a
+
+# Ready
+# let's shrink the image
+RUN apt-get remove -y maven
+RUN apt autoremove -y
+
+# This will only show the usage
+CMD a
+
+# a more useful use is:
+#	docker run a a --get queue1
+# note that 'a' has to be specified twice
+# the first one is the image name
+# the second one is the 'alternative' commands that we want to run