Issue #3447810 by fjgarlin, danielspeicher: Include for hidden variables cannot be found

private-modules.yml

@@ -24,6 +24,13 @@ include:
       - if: $CI_COMMIT_TAG
         when: never
       - if: $CI_COMMIT_BRANCH == "develop" || $CI_COMMIT_BRANCH =~ "/^feature\/.*/"
+  - remote: https://git.drupalcode.org/${_GITLAB_TEMPLATES_REPO}/-/raw/${_GITLAB_TEMPLATES_REF}/includes/include.drupalci.hidden-variables.yml
+    rules:
+      - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+        when: never
+      - if: $CI_COMMIT_TAG
+        when: never
+      - if: $CI_COMMIT_BRANCH == "develop" || $CI_COMMIT_BRANCH =~ "/^feature\/.*/"
   - remote: https://git.drupalcode.org/${_GITLAB_TEMPLATES_REPO}/-/raw/${_GITLAB_TEMPLATES_REF}/includes/include.drupalci.workflows.yml
     rules:
       - if: $CI_PIPELINE_SOURCE == "merge_request_event"