Dockerfile

# Pull base image
FROM java:8

ENV SCALA_VERSION 2.11.8
ENV SBT_VERSION 0.13.11
ENV PORT 8888

# Install Scala
## Piping curl directly in tar
RUN \
  curl -fsL http://downloads.typesafe.com/scala/$SCALA_VERSION/scala-$SCALA_VERSION.tgz | tar xfz - -C /root/ && \
  echo >> /root/.bashrc && \
  echo 'export PATH=~/scala-$SCALA_VERSION/bin:$PATH' >> /root/.bashrc

# Install sbt
RUN \
  curl -L -o sbt-$SBT_VERSION.deb http://dl.bintray.com/sbt/debian/sbt-$SBT_VERSION.deb && \
  dpkg -i sbt-$SBT_VERSION.deb && \
  rm sbt-$SBT_VERSION.deb && \
  apt-get update && \
  apt-get install sbt && \
  sbt sbtVersion

# Install postgresql
RUN apt-get install -y postgresql-9.4 postgresql-client-9.4

USER postgres

RUN    /etc/init.d/postgresql start && \
    psql --command "CREATE USER docker WITH SUPERUSER PASSWORD 'docker';" && \
    createdb -O docker docker

WORKDIR /app
EXPOSE $PORT

USER root

CMD service postgresql start && sbt ~re-start