Florian Müllner authored Jul 25, 2018 and Florian Müllner committed Aug 03, 2018

Our CI now generates flatpak bundles on successful builds, which
are intended for conveniently testing proposed changes with just
a couple of clicks. However for now we still miss that goal, due
to two important restrictions:

 - the bundle uses the same ID/branch as the nightly
   build, so it can conflict or interfere with the
   installation

 - if Polari is already running in the session, the bundle
   has to be launched manually with --test-instance to work

We will be able to address the former by adjusting the CI script to
use a dedicated branch, but to address the latter, we need explicit
support in the app. Add that in form of a compile time option for
producing development snapshots, which injects --test-instance into
the command line.

#61