Here is a repo where all the build outputs go.
You probably don't want to clone this directly or pull request. See the https://github.com/MiSTerArch/PKGBUILDs repo instead.
Due to the large nature of files in this repo there might also be history rewriting to prune things.
This git repo is also published via http://misterarch.hypertriangle.com/ (for pacman's use). See https://github.com/MiSTerArch/PKGBUILDs/blob/main/INSTALL.md#repository-setup for more info on how to use it.
Due to the 100MB GitHub file limit, whole sd cards can be found in the release section of this repo.