[gdm] (5 commits) Non-fast-forward update to branch wip/fix-double-greeters

[Iain Lane <iainl src gnome org>]

The branch 'wip/fix-double-greeters' 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:

  19ebc55... local-display-factory: add more debug messages to new vt ha
  ca46952... local-display-factory: don't start two greeters at startup
  aae8fb6... session-worker: don't switch VTs if we're already on the ri

Commits added to the branch:

  ca14628... Add CI to GDM. (*)
  8b163aa... Merge branch 'wip/nielsdg/add-ci' into 'master' (*)
  6243885... local-display-factory: add more debug messages to new vt ha
  0a79b55... local-display-factory: don't start two greeters at startup
  9f89861... session-worker: don't switch VTs if we're already on the ri

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