set env variable

.gitlab-ci.yml

@@ -108,7 +108,6 @@ check:links:
    stage: check
    image: docker:19.03.12
    variables:
-     #DOCKER_HOST: tcp://localhost:2376/
      DOCKER_TLS_CERTDIR: ""
      DOCKER_DRIVER: overlay2
    services:
@@ -121,7 +120,7 @@ check:links:
      - cp .ci/jsonWhitelist.txt build/external/.
      - cp -r build/external checkFolder
    script:
-     - docker run -v "$(pwd)"/build/external:/checkFolder -t git-r3lab.uni.lu:4567/r3/apps/tailorbird/linkchecker
+     - docker run -v "$(pwd)"/build/external:/checkFolder -t $CI_REGISTRY/r3/apps/tailorbird/linkchecker
 
 # generate
 # ------------------------------------------------------------------------------------