You're probably looking for:
https://github.com/EIGHTFINITE/pmd-sky/tree/main
https://github.com/EIGHTFINITE/pmd-sky/blob/main/.github/workflows/build.yml#L20-L35
https://github.com/EIGHTFINITE/pmd-sky/blob/main/INSTALL.md
Or if you want to start coding:
git init .
git remote add origin https://github.com/EIGHTFINITE/pmd-sky.git
git remote add pret https://github.com/pret/pmd-sky.git
git fetch --force --all --tags
git reset --hard refs/remotes/origin/main
git checkout -B main refs/remotes/origin/main