Fix build clarin

.gitlab-ci.yml

@@ -51,6 +51,8 @@ build_clarin_json:
   image: docker:18.09.7
   services:
     - 'docker:18.09.7-dind'
+  before_script:
+    - ''
   script:
     - docker build -t $CI_REGISTRY_IMAGE:clarin-json .
     - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY