[four-in-a-row] (3 commits) Non-fast-forward update to branch flatpak-ci

[Michael Catanzaro <mcatanzaro src gnome org>]

The branch 'flatpak-ci' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  9352f07... Gitlab CI: build flatpak nightlies

Commits added to the branch:

  12d56a0... buildsystem: switch to using meson (*)
  6f5eacd... buildsystem: ditch autotools (*)
  765b5df... Gitlab CI: build flatpak nightlies

(*) This commit already existed in another branch; no separate mail sent