Dockerfile : Jenkins container, with gradle, nodejs, npm and postgres installations

Dockerfile

# Dockerfile, installs gradle , nodejs, npm and postgress on jenkins base image

FROM jenkins
MAINTAINER "phoenix"

USER root

# Set proxy if needed
ENV  http_proxy ""
ENV  https_proxy ""

# gradle version
ENV GRADLE_VERSION 2.11

# Install gradle, cd to /var/jenkins_home
WORKDIR  /usr/bin

RUN  curl -sLO https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-all.zip && \
     unzip gradle-${GRADLE_VERSION}-all.zip && \
     ln -s gradle-${GRADLE_VERSION} gradle && \
     rm gradle-${GRADLE_VERSION}-all.zip

ENV  GRADLE_HOME /usr/bin/gradle
ENV  PATH $PATH:$GRADLE_HOME/bin

# Install nodejs and npm
RUN  DEBIAN_FRONTEND=noninteractive  apt-get update &&  apt-get install -y nodejs  npm

# symlink nodejs as node
RUN  ln -s /usr/bin/nodejs /usr/bin/node

# Install gulp globally
RUN  npm install -g gulp

EXPOSE 8080

# Add the PostgreSQL PGP key to verify their Debian packages.
# It should be the same key as https://www.postgresql.org/media/keys/ACCC4CF8.asc
RUN apt-key adv --keyserver keyserver.ubuntu.com  --recv-keys B97B0AFCAA1A47F044F244A07FCC7D46ACCC4CF8

# Add PostgreSQL's repository. It contains the most recent stable release
#     of PostgreSQL, ``9.4``.
RUN echo "deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main" > /etc/apt/sources.list.d/pgdg.list

# Install ``python-software-properties``, ``software-properties-common`` and PostgreSQL 9.4
#  There are some warnings (in red) that show up during the build. You can hide
#  them by prefixing each apt-get statement with DEBIAN_FRONTEND=noninteractive
#
RUN apt-get update && apt-get install -y python-software-properties software-properties-common postgresql-9.4  postgresql-client-9.4 postgresql-contrib-9.4

# Note: The official Debian and Ubuntu images automatically ``apt-get clean``
# after each ``apt-get``

# Run the rest of the commands as the ``postgres`` user created by the ``postgres-9.4`` package when it was ``apt-get installed``
USER postgres

# Create a PostgreSQL role named ``pgadmin`` with ``pgadmin`` as the password and
# then create a database `somedatabase` owned by the ``pgadmin`` role.
# Note: here we use ``&&\`` to run commands one after the other - the ``\``
#       allows the RUN command to span multiple lines.
RUN    /etc/init.d/postgresql start &&\
       psql --command "CREATE USER pgadmin  WITH SUPERUSER PASSWORD 'pgadmin';" &&\
       createdb -O  pgadmin somedatabase

USER root
# Adjust PostgreSQL configuration so that remote connections to the
# database are possible.
RUN echo "host all  all    0.0.0.0/0  md5" >> /etc/postgresql/9.4/main/pg_hba.conf

# And add ``listen_addresses`` to ``/etc/postgresql/9.4/main/postgresql.conf``
RUN echo "listen_addresses='*'" >> /etc/postgresql/9.4/main/postgresql.conf

# Expose the PostgreSQL port
EXPOSE 5432

RUN mkdir -p /var/run/postgresql && chown -R postgres /var/run/postgresql

# Add VOLUMEs to allow backup of config, logs and databases
VOLUME  ["/etc/postgresql", "/var/log/postgresql", "/var/lib/postgresql"]

# Reset proxy
ENV http_proxy ""
ENV https_proxy ""

# Set the default command to run when starting the container
# CMD ["/usr/lib/postgresql/9.4/bin/postgres", "-D", "/var/lib/postgresql/9.4/main", "-c", "config_file=/etc/postgresql/9.4/main/postgresql.conf"]