CI: second attempt to make containers rebuild when changed

.gitlab-ci.yml

@@ -251,10 +251,11 @@ pages:
   stage: deploy
   image: docker:20.10.12
   needs: ["containers"]
-  rules:
-    - changes:
-        - containers/*
-    - if: $CI_PIPELINE_SOURCE == "schedule"
+  except:
+    refs:
+      - schedules
+    changes:
+      - containers/*
   script:
     - cd containers
     - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY