Cannot use variables defined outside for bocker build part, the strategy

is to then rename the image in the registry after it has been pushed. I
am using the pipelineID to identify the image uniquely.

.gitlab-ci.yml

@@ -54,5 +54,5 @@ ctafrontend_docker:
   script:
     - ""
   variables:
-    TO: gitlab-registry.cern.ch/cta/cta-orchestration:${CI_PIPELINE_ID}git${CI_BUILD_REF:0:8}
+    TO: gitlab-registry.cern.ch/cta/cta-orchestration:${CI_PIPELINE_ID}
     DOCKER_FILE: continuousintegration/docker/ctafrontend/cc7/Dockerfile