`output` folder for `json` reports under `github.workspace`

* [583e8d4](https://github.com/kangwonlee/python-homework-template/commit/583e8d41489fc9e40befe5ba9c7411f95c6166b3)
* It may be more secure to create an `output` folder for json reports
* `docker` mount it as `rw` permission
* mount all other with `ro` permission

Start by reviewing commit 583e8d4 and locating the workflow or entry point that writes JSON reports under github.workspace. Trace how Docker mounts the workspace and document the intended read/write boundaries. Done means reports use a dedicated output folder, Docker can write there, and other mounted workspace content remains read-only.

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