Rename the posgresql to postgres, add the Dockerfile for postgres image.

dockerfiles/images/postgres/Dockerfile

@@ -0,0 +1,49 @@
+FROM ubuntu
+MAINTAINER SvenDowideit@docker.com
+
+# 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 hkp://keyserver.ubuntu.com:80 --recv-keys B97B0AFCAA1A47F044F244A07FCC7D46ACCC4CF8
+
+# Add PostgreSQL's repository. It contains the most recent stable release
+#     of PostgreSQL, ``9.3``.
+RUN echo "deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main" > /etc/apt/sources.list.d/pgdg.list
+
+# Update the Ubuntu and PostgreSQL repository indexes
+RUN apt-get update
+
+# Install ``python-software-properties``, ``software-properties-common`` and PostgreSQL 9.3
+#  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 -y -q install python-software-properties software-properties-common
+RUN apt-get -y -q install postgresql-9.3 postgresql-client-9.3 postgresql-contrib-9.3
+
+# 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-9.3`` package when it was ``apt-get installed``
+USER postgres
+
+# Create a PostgreSQL role named ``docker`` with ``docker`` as the password and
+# then create a database `docker` owned by the ``docker`` 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 root WITH SUPERUSER PASSWORD 'THE_DB_PASSWORD';" &&\
+    createdb -O root gogs
+
+# 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/9.3/main/pg_hba.conf
+
+# And add ``listen_addresses`` to ``/etc/postgresql/9.3/main/postgresql.conf``
+RUN echo "listen_addresses='*'" >> /etc/postgresql/9.3/main/postgresql.conf
+
+# Expose the PostgreSQL port
+EXPOSE 5432
+
+# Add VOLUMEs to allow backup of config, logs and databases
+VOLUME	["/etc/postgresql", "/var/log/postgresql", "/var/lib/postgresql"]
+
+# Set the default command to run when starting the container
+CMD ["/usr/lib/postgresql/9.3/bin/postgres", "-D", "/var/lib/postgresql/9.3/main", "-c", "config_file=/etc/postgresql/9.3/main/postgresql.conf"]