Builder to package up custom components for Home Assistant.
These packages use `buildPythonPackage` with `format = "other"` and
rely on a custom install phase, that expects a standardized path,
and a custom check phase, that for now verifies python dependencies have
been satisified.
Co-Authored-By: Martin Weinelt <hexa@darmstadt.ccc.de>
Co-Authored-By: Sandro Jäckel <sandro.jaeckel@gmail.com>
