Fix CI config

cleanup is not a stage by default, it has to be specified

.gitlab-ci.yml

@@ -34,6 +34,10 @@ before_script:
         -e "GRANT ALL ON test_$DBNAME.* TO '$DBUSER'@'%'"
     - pip install --cache-dir vendor/pip -t vendor/python -r requirements-devel.txt
 
+stages:
+    - test
+    - cleanup
+
 test:
     stage: test
     script: