Link ParticleOS images in the workflow subproject for the PR,
so that they can be enabled with a click when needed.
But keep disabled by default, as they take a lot of resources,
especially disk space.
Build packages on OBS against the PR and reports status back
to Github. This just builds the systemd package for now, next
step is to also build particleos images.
This does not work yet, as we configure multiple git sources,
and the workflow service gets confused. We need to update one
(the actual code repo) and leave the recipe repos intact, but
this is not supported right now.
This reverts commit 01f05f0087.
The package is logistically separated, as the rpm sources conflict from Fedora
conflict with the rpm sources from SUSE (some files have the same name and
location but different, incompatible content), so Fedora builds can't be
triggered from the same package. The result is the same.