Note that there are no branches of OpenModelica (check OpenModelica.git!).
To build and package such things? The debian package build system is not that simple to just copy around. And simply creating a tarball with the built OMC would not work either (because the system libraries are different on different Ubuntu versions; you would need to run the same OS as the Hudson system). You would anyway need a location to put these packages, and I don't think we have such a location... Never mind giving them version names that sort correctly.
And when it comes to things like having OMEdit in a branch, it is harder. Because it is developed in a different location (Adeel would need to setup and maintain forks of all OpenModelica repositories in his base URL).
If it is just about building an experimental version of OMEdit or OMC (not the entire installer), something simpler could be done.