Revert "SSI smoke tests should only run as part of nightly (#8914)" (#8924)

This reverts commit c06ee54.

Author: bric3

.gitlab-ci.yml

@@ -557,9 +557,7 @@ test_smoke:
 
 test_ssi_smoke:
   extends: .test_job
-  rules:
-    - if: $CI_PIPELINE_SOURCE == "schedule"
-      when: on_success
+  rules: *master_only
   variables:
     GRADLE_TARGET: "stageMainDist :smokeTest"
     CACHE_TYPE: "smoke"