prohibit int release pipeline from running on schedules

.gitlab-ci.yml

@@ -55,6 +55,9 @@ deploy-int-release-dev-cscs:
   resource_group: shared-NFS-mount-dev-cscs
   only:
     - master
+  rules:
+    - if: '$CI_PIPELINE_SOURCE == "schedule"'
+      when: never
 
 # Deploy the production release of tools (manual pipeline)
 # deploy on the production environment of the okd prod cluster at CSCS