FIX: ci docker build

.gitlab-ci.yml

@@ -4,6 +4,5 @@ services:
 
 build-image:
   script:
-    - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
     - docker build -t $CI_REGISTRY_IMAGE slides/.
     - docker push $CI_REGISTRY_IMAGE
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