rpmbuild-bot: Add auto cleanup of old packages

[dmik]

We should purge old packages as new ones get released — this is to avoid cluttering the repositories with outdated and unneeded RPMs. Currently we do it by hand which is very time consuming and error prone.

A better idea is to teach rpmbuild-bot to automatically move outdated packages to a trash area when newer ones for a given program are uploaded. The trash is then to be purged each few months. This approach will require to store package build logs (used as indexes to collect RPM files belonging to a single build) on the repository machine rather than locally. But that's a needed feature anyway as it will allow to e.g. move packages between repositories not only by a person who built it but by anyone who has the required access.

[Silvan Scherrer]

moved to ​https://github.com/bitwiseworks/rpmbuild-bot/issues/3