Container with pre-installed dependencies to speed up builds

.gitlab-ci.yml

+build_image:
+  image: docker:git
+  services:
+  - docker:dind
+  script:
+    - docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN docker.steamhaus.co.uk
+    - docker build -t docker.steamhaus.co.uk/steamhaus/gitlab_ci_container .
+    - docker run docker.steamhaus.co.uk/steamhaus/gitlab_ci_container
+    - docker push docker.steamhaus.co.uk/steamhaus/gitlab_ci_container:latest
+  only:
+    - master
\ No newline at end of file

Dockerfile

+FROM centos:latest
+MAINTAINER Steamhaus <tech@steamhaus.co.uk>
+
+ENV PACKER_URL https://releases.hashicorp.com/packer/0.10.1/packer_0.10.1_linux_amd64.zip
+ENV AMICLEANER_VERSION 0.1.2
+
+RUN yum install -y git wget epel-release ansible unzip ruby\
+&& wget https://bootstrap.pypa.io/get-pip.py\
+&& python get-pip.py\
+&& yum update -y\
+&& wget ${PACKER_URL}\
+&& unzip packer_0.10.1_linux_amd64.zip\
+&& mv packer /usr/local/bin/packer\
+&& wget https://github.com/bonclay7/aws-amicleaner/archive/v${AMICLEANER_VERSION}.zip\
+&& unzip v${AMICLEANER_VERSION}.zip\
+&& chmod 755 aws-amicleaner-0.1.2/amicleaner/cli.py\
+&& pip install -r aws-amicleaner-0.1.2/requirements.txt\
+&& ln -s /aws-amicleaner-0.1.2/amicleaner/cli.py /usr/local/bin/amicleaner