fix typo

.gitlab-ci.yml

@@ -11,7 +11,7 @@ variables:
   DOCKER_DRIVER: overlay2
   CONTAINER_IMAGE: lab.compute.dtu.dk:5005/${CI_PROJECT_PATH}/proxy
   CONTAINER_TEST_IMAGE: ${CI_REGISTRY_IMAGE}/proxy:$CI_COMMIT_SHORT_SHA
-  CONTAINER_RELEASE_IMAGE: ${CI_REGISTRY_IMAGE}/proxy:$CI_COMMIT_REF_SLUG
+  CONTAINER_RELEASE_IMAGE: ${CI_REGISTRY_IMAGE}/proxy:$CI_COMMIT_REF_NAME
   GIT_SUBMODULE_STRATEGY: recursive
 
 build: