osc package cache still broken for product builds

[adrianschroeter]

This is a reminder for us that we still need to fix the osc local package cache.

There are still situations (eg. product builds) where the same rpm file name exists in different builds. Eg. src.rpm from i586 and x86_64.

One way to solve this would be to prefix the md5sum in the cache.

Another way might be to simplify the buildinfo in this case and only download and verify only one version. We can currently also only put one of them inside of the repository provided to the build. So we would not really loose any functionality.

[dmach]

I believe this is at least slightly related to openSUSE/open-build-service#13821