try to debug gitlab ci script

.gitlab-ci.yml

@@ -41,6 +41,8 @@ test_server:
 
 build_client:
   before_script: 
+    - echo $CI_REGISTRY
+    - echo $CI_REGISTRY_USER
     - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
   variables: 
     CLIENT_IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG