Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -9,7 +9,7 @@ image:
   entrypoint: [""]
 
 release-build:
-  stage: release
+  stage: build
   image: gitlab.cl.uni-heidelberg.de:5050/tmueller/clspigot-docker:latest
   rules:
     - if: $CI_COMMIT_TAG                  # Run this job when a tag is created manually