CI: Use CI to publish nightlies

Nightlies are no longer produced by sdkbuilder.gnome.org. Instead
they are build on gbm.gnome.org. With the CI template we can push
our latest builds directly to the repo.

See https://gbm.gnome.org/gbm-nightly.flatpakrepo for the new repo.
4 jobs for wip/christopherdavis/update-ci in 6 minutes and 10 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Check
passed #371436
check

00:00:32

 
  Test
failed #371437
flatpak

00:05:37

 
  Review
skipped #371438
review
skipped #371439
allowed to fail manual
stop_review
 
Name Stage Failure
failed
flatpak Test

A full log can be found at /builds/BrainBlasted/fractal/_build/meson-logs/meson-log.txt
Uploading artifacts...
WARNING: org.gnome.FractalDevel.flatpak: no matching files
WARNING: repo/: no matching files
_build/meson-logs/meson-log.txt: found 1 matching files

WARNING: _build/meson-logs/testlog.txt: no matching files
Uploading artifacts to coordinator... ok
id=371437 responseStatus=201 Created token=8QYzHrc4
ERROR: Job failed: exit code 1