fix pipeline for MR into master

Create dummy jobs only for MR into other branches.

.gitlab-ci.yml

@@ -480,6 +480,7 @@ dummy for MR:
   script: ["true"]
   rules:
     - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+          && $CI_MERGE_REQUEST_TARGET_BRANCH_NAME != $CI_DEFAULT_BRANCH
           && $FORCE_UNIT_TESTS != "yes"
           && $FORCE_INTEGRATION_TESTS != "yes"
           && $FORCE_SYSTEM_TESTS != "yes"