Use correct branch to trigger

.gitlab-ci.yml

@@ -3,6 +3,8 @@ stages:
 
 trigger:slub-website:
     stage: trigger
-    trigger: typo3/portals/slub-website
+    trigger: 
+        project: typo3/portals/slub-website
+        branch: task/add-build-deployment
     rules:
         - if: $CI_COMMIT_BRANCH =~ /^task/