Comment 1 for bug 1646596

This would be a very highly welcome change in Bileto as there just needs to be flexibility on setting dependencies. Right now we're wrongly assuming that the overlay is what we want, but there are even cases where we don't want to use the overlay and only use the archive, or like in the snapshot case. Not to mention future uses of Bileto by different teams like cloud etc - those wouldn't want to use the overlay but maybe some other PPA instead.