display yarn version and node version within CI logs

.gitlab-ci.yml

@@ -107,6 +107,8 @@ setup-test-env:
   <<: *dedicated-runner
   stage: prepare
   script:
+    - node --version
+    - yarn --version
     - yarn install
     - bundle exec rake gitlab:assets:compile
     - bundle exec ruby -Ispec -e 'require "spec_helper" ; TestEnv.init'