In the interests of saving time, CO2, and DA $$, what do y'all think about changing the default gitlab_templates pipelines so that all of the `OPT_IN_TEST_*`  jobs must be triggered manually instead of running automatically? So by default, all pipelines only run a single branch of core, but if maintainers opt in to other testing, it's easy to manually trigger on "exotic" versions of core when an MR is getting close to merge-able? I just did it manually for one of my contrib projects: https://www.drupal.org/project/pathologic/issues/3579376 but it'd be nice not to have to go out of my way for that. **Tasks remaining** - [x] Use a new set of variables with text-based values 'manual' or 'always', - [x] Implement the rule for six Drupal Core variants - [x] Implement for Drupal CMS - [x] Change `variables.yml` - [x] Restrict to a valid set of strings - [x] Replicate in the Drupal7 pipeline definition - [x] Update documentation - [x] Remove temporary changes and re-test > Change record: [#3584979](https://www.drupal.org/node/3584979)