Merge branch 'packer' into 'master'

Add dockerfile for jessie-slim with packer integrated

See merge request !29

.gitlab-ci.yml

@@ -39,6 +39,7 @@ trusty test: *test_build
 xenial test: *test_build
 opensuse13.2 test: *test_build
 opensuse42.1 test: *test_build
+jessie_packer test: *test_build
 wheezy: *build_and_deploy
 centos7: *build_and_deploy
@@ -52,3 +53,4 @@ trusty: *build_and_deploy
 xenial: *build_and_deploy
 opensuse13.2: *build_and_deploy
 opensuse42.1: *build_and_deploy
+jessie_packer test: *build_and_deploy

docker/Dockerfile_jessie_packer

+FROM debian:jessie-slim
+MAINTAINER GitLab Inc. <support@gitlab.com>
+
+# Install required packages
+RUN apt-get update -q
+RUN DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends \
+      zlib1g-dev \
+      git \
+      gcc \
+      libssl-dev \
+      libreadline-dev \
+      make \
+      curl \
+      ca-certificates \
+      locales \
+      libcurl4-openssl-dev \
+      libexpat1-dev \
+      gettext \
+      libssl-dev \
+      unzip && apt-get -yq clean
+
+RUN echo "en_US.UTF-8 UTF-8" > /etc/locale.gen
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+ENV LC_ALL en_US.UTF-8
+
+ENV GIT_VERSION 2.7.4
+RUN curl -fsSL "https://www.kernel.org/pub/software/scm/git/git-${GIT_VERSION}.tar.gz" \
+	| tar -xzC /tmp \
+  && cd /tmp/git-2.7.4 \
+  && ./configure \
+  && make all \
+  && make install
+
+ENV RUBY_VERSION 2.3.3
+RUN curl -fsSL "https://cache.ruby-lang.org/pub/ruby/2.3/ruby-${RUBY_VERSION}.tar.gz" \
+  | tar -xzC /tmp \
+  && cd /tmp/ruby-2.3.3 \
+  && ./configure --disable-install-rdoc --disable-install-doc --disable-install-capi\
+  && make \
+  && make install
+
+ENV RUBYGEMS_VERSION 2.6.8
+RUN /usr/local/bin/gem update --system ${RUBYGEMS_VERSION} --no-ri --no-rdoc
+
+ENV BUNDLER_VERSION 1.13.6
+RUN /usr/local/bin/gem install bundler --version ${BUNDLER_VERSION} --no-ri --no-rdoc
+
+RUN mkdir -p /opt/gitlab /var/cache/omnibus ~/.ssh
+
+RUN git config --global user.email "packages@gitlab.com"
+RUN git config --global user.name "GitLab Inc."
+
+RUN curl -Lo /tmp/packer.zip https://releases.hashicorp.com/packer/0.12.2/packer_0.12.2_linux_amd64.zip && \
+    unzip /tmp/packer.zip -d /usr/local/bin
+
+RUN rm -rf /tmp/*