The nixpkgs-unstable channel's programs.sqlite was used to identify
packages producing exactly one binary, and these automatically added
to their package definitions wherever possible.
because we're playing with its install requirements, add a
pythonImportsCheck to give us a chance to discover brokenness. technically
this isn't a realistic test of end user behaviour as this is really an
application, not a python module, but it seems to have a pretty stable
import name of `fierce`, so it works.