Comment 3 for bug 554621

Separate to my previous comment, I have another use-case for wanting post-build binary copies, in this case, from one PPA to another. I build mercurial, which has an arch-all and an arch-any binary package. In order to prevent the user-facing PPA from becoming uninstallable on amd64 (and lpia) when the published versions are skewed, I build all uploads in a staging PPA, and binary-copy to the user-facing PPA only when builds on all architectures are complete.