Add GitLab QA base image

.gitlab-ci.yml

@@ -34,6 +34,7 @@ ruby-2.3-static-analyses test: *test_build
 www-gitlab-com test: *test_build
 doc-gitlab-com test: *test_build
 terraform-0.1 test: *test_build
+gitlab-qa test: *test_build
 ruby-2.1-git-2.7-phantomjs-2.1: *build_and_deploy
 ruby-2.3-git-2.7-phantomjs-2.1: *build_and_deploy
@@ -42,3 +43,4 @@ ruby-2.3-static-analyses: *build_and_deploy
 www-gitlab-com: *build_and_deploy
 doc-gitlab-com: *build_and_deploy
 terraform-0.1: *build_and_deploy
+gitlab-qa: *build_and_deploy

Dockerfile.gitlab-qa

+FROM ruby:2.3
+
+WORKDIR /home/qa
+
+RUN wget -q https://get.docker.com/builds/Linux/x86_64/docker-1.12.1.tgz && \
+    tar -zxf docker-1.12.1.tgz && mv docker/docker /usr/local/bin/docker && \
+    rm docker-1.12.1.tgz