The variable name `matrix` in the `detect-changes` job output was ambiguous and potentially confusing, as `matrix` is a reserved keyword in Gitea/GitHub Actions syntax for defining job strategies.
This change renames the output variable to `image_list` to better reflect its content (a JSON array of image names) and avoid naming conflicts or confusion with the actual `strategy.matrix` configuration.
Changes:
- Renamed output `matrix` to `image_list` in `detect-changes` job.
- Updated all shell script references in the change detection logic.
- Updated the consumer job `build-push-images` to use `needs.detect-changes.outputs.image_list`.
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