Use 'rules' in '.gitlab/ci/pages.gitlab-ci.yml'

Signed-off-by: Rémy Coutable <remy@rymai.me>

.gitlab/ci/pages.gitlab-ci.yml

+# Make sure to update all the similar conditions in other CI config files if you modify these conditions
+.if-canonical-dot-com-gitlab-org-group-master-refs: &if-canonical-dot-com-gitlab-org-group-master-refs
+  if: '$CI_SERVER_HOST == "gitlab.com" && $CI_PROJECT_NAMESPACE == "gitlab-org" && $CI_COMMIT_REF_NAME == "master"'
+
 pages:
   extends:
     - .default-tags
     - .default-retry
     - .default-cache
-    - .default-only
-    - .only:variables-canonical-dot-com
-    - .only:changes-code-backstage-qa
-  only:
-    refs:
-      - master
+  rules:
+    - <<: *if-canonical-dot-com-gitlab-org-group-master-refs
+      when: on_success
   stage: pages
   dependencies: ["coverage", "karma", "gitlab:assets:compile pull-cache"]
   script: