Update git push command in .gitlab-ci.yml

.gitlab-ci.yml

@@ -18,7 +18,7 @@ update_dockerfile:
     - git add alma9-base/Dockerfile
     - git commit -m "Update upstream to version $(grep -oP "FROM cern/alma9-base:\K[\w.-]+" "alma9-base/Dockerfile")"
     - git remote set-url --push origin "https://$CI_COMMITTER_USER_AND_TOKEN@gitlab.etp.kit.edu/cverstege/docker-images.git"
-    - git push HEAD:$CI_COMMIT_REF_NAME
+    - git push origin HEAD:$CI_COMMIT_REF_NAME
   rules:
     - if: $CI_PIPELINE_SOURCE == "schedule"
       when: always