Add timestamp attribute to build metadata in warehouse
Add timestamp attribute to build metadata in warehouse

The timestamp is in seconds since epoch UTC.

henrysher/imagefactory,LalatenduMohanty/imagefactory,jmcabandara/imagefactory,jmcabandara/imagefactory,redhat-imaging/imagefactory,redhat-imaging/imagefactory,LalatenduMohanty/imagefactory,henrysher/imagefactory