Using my pull-through cache for docker hub

.gitlab-ci.yml

-
 variables:
   REGISTRY_IMAGE: registry.light.kow.is/kowis/roundcubemail
 
@@ -8,7 +7,7 @@ build:
   stage: build
   script:
     - docker login -u $REGISTRY_USER -p $REGISTRY_PASS registry.light.kow.is
-    - docker pull roundcube/roundcubemail:latest-fpm-alpine
+    - docker pull registry.light.kow.is/docker-hub/roundcube/roundcubemail:latest-fpm-alpine
     - cd roundcube
     - docker build --tag $REGISTRY_IMAGE:latest .
     - docker push $REGISTRY_IMAGE:latest