feature request: hook to keep/track self-built packages

[Dieterbe]

Hi,
when I install packages, and they come from AUR I want to keep these packages in a special location (not just the package cache), I want to upload them to my local custom repository so that if I install the same package on another pc, I don't need to go to through the whole manual pkgbuild verification-building process again.

I could of course just mirror the entire package cache but that would use too much space.
Is there a way for me to invoke a custom script when clyde has built a package?