I'd like to have the AUR installed package installed on the pacman cache.
This could easily be done by copying the .tar.xz file to CacheDir option (default is /var/cache/pacman/pkg/). If the package is installed by using pacman -U file:///path/to/package.tar.xz, it'll be automatically added to the cache, but then it depends on RemoteFileSigLevel option, which is Required by default. So this solution would need some workaround.
I'd like to have the AUR installed package installed on the pacman cache.
This could easily be done by copying the .tar.xz file to CacheDir option (default is /var/cache/pacman/pkg/). If the package is installed by using pacman -U file:///path/to/package.tar.xz, it'll be automatically added to the cache, but then it depends on RemoteFileSigLevel option, which is Required by default. So this solution would need some workaround.