Add a build preparation script, modify gitlab.ci.yml to use the script.

.gitlab-ci.yml

 # This file is generated by GitLab CI
 before_script:
-  - export PATH=$HOME/bin:/usr/local/bin:/usr/bin:/bin
+  - ./bin/build_prepare.sh
   - ruby -v
   - which ruby
-  - gem install bundler
-  - which bundle
-  - echo $PATH
-  - cp config/database.yml.mysql config/database.yml
+  - gem install bundler --no-ri --no-rdoc
   - cp config/gitlab.yml.example config/gitlab.yml
-  - 'sed "s/username\:.*$/username\: runner/" -i config/database.yml'
-  - 'sed "s/password\:.*$/password\: ''password''/" -i config/database.yml'
-  - sed "s/gitlabhq_test/gitlabhq_test_$((RANDOM/5000))/" -i config/database.yml
   - touch log/application.log
   - touch log/test.log
-  - bundle install --without postgres production --jobs $(nproc)
+  - bundle install --without postgres production --jobs $(nproc)  "${FLAGS[@]}"
   - bundle exec rake db:create RAILS_ENV=test
 Rspec:
   script:
@@ -48,4 +42,4 @@ Brakeman:
     - bundle exec rake brakeman
   tags:
     - ruby
-    - mysql
\ No newline at end of file
+    - mysql

bin/prepare_build.sh

+#!/bin/bash
+if [ -f /.dockerinit ]; then
+    wget -q http://ftp.de.debian.org/debian/pool/main/p/phantomjs/phantomjs_1.9.0-1+b1_amd64.deb
+    dpkg -i phantomjs_1.9.0-1+b1_amd64.deb
+
+    apt-get update -qq
+    apt-get install -y -qq libicu-dev libkrb5-dev cmake nodejs
+
+    cp config/database.yml.mysql config/database.yml
+    sed -i 's/username:.*/username: root/g' config/database.yml
+    sed -i 's/password:.*/password:/g' config/database.yml
+    sed -i 's/# socket:.*/host: mysql/g' config/database.yml
+
+    cp config/resque.yml.example config/resque.yml
+    sed -i 's/localhost/redis/g' config/resque.yml
+    FLAGS=(--deployment --path /cache)
+    export FLAGS
+else
+    export PATH=$HOME/bin:/usr/local/bin:/usr/bin:/bin
+    cp config/database.yml.mysql config/database.yml
+    sed "s/username\:.*$/username\: runner/" -i config/database.yml
+    sed "s/password\:.*$/password\: 'password'/" -i config/database.yml
+    sed "s/gitlabhq_test/gitlabhq_test_$((RANDOM/5000))/" -i config/database.yml
+fi