### Summary We can reuse common parts of CI configuration when setting up `script`, `before_script`, and the like. This really comes in handy. Alas, we cannot do this to `stages` yet. ### Steps to reproduce Paste the following to linter: ``` .common_stages: - build - deploy stages: - !reference [.common_stages] - analysis ``` ### What is the current *bug* behavior? Linter gives error: `stages config should be an array of strings` ### What is the expected *correct* behavior? `stages` are flattened the same way it happens to `script`, `before_script`, etc. GitLab treats resulting `stages` as if it was written the following way: ``` stages: - build - deploy - analysis ``` ### Environment GitLab 13.10 ### Misc Should be related to gitlab-foss#32973.