change gitlab-ci configuration

.gitlab-ci.yml

-before_script:
-  - bundle install
-
-stages:
-  - test
-
 test:
   script:
-    - bundle exec rake db:migrate RAILS_ENV=test
-    - bundle exec rake test RAILS_ENV=test
-  only:
-    - master
+  - apt-get update -qy
+  - apt-get install -y nodejs
+  - bundle install --path /cache
+  - bundle exec rake db:create RAILS_ENV=test
+  - bundle exec rake test
+