The repo have not any source code of sing-box, it monitor sing-box original repo ( https://github.com/SagerNet/sing-box ), build and release some arch that the original repo not released, automatic done when new tag added ( stable only, not include pre-release ).
The repo build and release list:
- linux mipsel hardfloat
- linux mipsel softfloat
- linux arm v7
- freebsd amd64
You can get source code of sing-box and other arch binary file from original repo.