Sync from gitlab to harbor, not from upstream

Should help with dockerhub rate limits

sync_image.sh

@@ -62,7 +62,7 @@ for tag in $(echo "${tags_to_sync[@]}" ); do
   if [[ ! " ${harbor_repo_tags[@]} " =~ " ${tag} " ]]; then
     # Update
     echo ""
-    until skopeo copy --dest-creds "${HARBOR_ROBOT_NAME}:${HARBOR_ROBOT_TOKEN}" "docker://${repo}:${tag}" "docker://registry.cern.ch/magnum/${image_name}:${tag}"
+    until skopeo copy --dest-creds "${HARBOR_ROBOT_NAME}:${HARBOR_ROBOT_TOKEN}" "docker://${CI_REGISTRY_IMAGE}/${image_name}:${tag}" "docker://registry.cern.ch/magnum/${image_name}:${tag}"
     do
       ((i++))
       if [ $i -gt 5 ] ; then