L2SS-752: Fix incorrect logic inversion

.gitlab-ci.yml

@@ -70,7 +70,7 @@ docker_store_images_changes:
   rules:
     - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
       when: never
-    - if: '$CI_COMMIT_TAG == null'
+    - if: '$CI_COMMIT_TAG != null'
       when: never
     - if: '$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH'
       when: never