Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -23,6 +23,7 @@ before_script:
   # you will overwrite your user's SSH config.
   - mkdir -p ~/.ssh
   - '[[ -f /.dockerenv ]] && echo -e "Host *\n\tStrictHostKeyChecking no\n\n" >> ~/.ssh/config'
+  - docker info
 
 build_clang:
   stage: build