[bmn_]

Get a Nemo or Sailfish device. http://enwp.org/File:Mer_and_mobile_operating_systems.svg

Public build service is https://openrepos.net/ and it already has lots of packages that you know from a normal Linux desktop and you can also host your custom stuff there. High-level package manager is packagekit or zypper.

Having a private repo is easy, too. Package format is RPM, repo format is http://createrepo.baseurl.org/