This page is now a pretty simple stub. Feel free to look at the history of it but almost everything should be automagically managed by puppet if you do the following.
Apply role::package::builder on a Cloud VPS instance Documentation is kept up to date at https://phabricator.wikimedia.org/diffusion/OPUP/browse/production/modules/package_builder/
Apply role::labs::lvm::srv to get additional disk space at /srv. Apply role::package::builder