This is a suggestion for using the toaster http interface for publishing the image and package feeds of what toaster itself builds. The flow could be modified to add a check at the stage where you're ordering a build to happen whether you want its image/packages published. Then at some configured http url you should be able to install the packages built via a package manager or pull the images.
This is an old suggestion, and will not be implemented unless someone voluteers with a specific need and design.