Dockerfile JDBC

# Dockerfile: create the image for jdbc testing ('local-dbtest')
FROM openjdk:8-jdk-alpine

RUN mkdir /code

COPY ./*.java /code

RUN mkdir /opt
ADD https://jdbc.postgresql.org/download/postgresql-42.1.4.jar /opt
#COPY ./postgresql-42.1.4.jar /opt

RUN cd /code && javac DBTest.java

CMD java -classpath "/code:/opt/*" DBTest