Test idempotent option value assignment
Summary
- Adds
ci-duplicate.nixthat sets the samegitlab.cioption values asci.nixfrom a separate file - Both files are auto-imported by import-tree, verifying that the module system merges identical values from different files without conflict
- Depends on !64 (merged) (which adds
key = "gitlab-ci"for module declaration deduplication)
Requested by @locallycompact in !64 (merged).
cc @nastypants @locallycompact