Support additional variables in the include field
This is a follow up from #219065 (closed) and #276515 (closed) where we implement support for a set of variables
- Project Predefined variables
✅ - Project variables
✅ - Group variables
✅ - Instance variables
✅ - Variables added when a pipeline is created manually via the UI or API
🚫 - Pipeline predefined variables
🚫
This issue is for completing the list of supported variables
Documentation
Based on the discussion below we should document that we will not have all pipeline predefined variables. For example; we won't have CI_PIPELINE_IID and CI_PIPELINE_CREATED_AT because the pipeline doesn't persist yet. (we can add additional variables if we'll discover more)