CachyOS/CachyOS-PKGBUILDS

AI Summary: Implement a CI action to validate the PKGBUILD files within the CachyOS PKGBUILDs repository. This involves creating a GitHub Actions workflow that automatically checks the validity of each PKGBUILD file, likely using `makepkg` or a similar tool, and reporting any errors. The provided example points to a specific invalid PKGBUILD file that should be used as a test case.