[vala] (12 commits) Non-fast-forward update to branch wip/ci

[Rico Tzschichholz <ricotz src gnome org>]

The branch 'wip/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:

  c6f6b59... ci: Add .gitlab-ci.yml
  b380e8b... ci: Always deploy
  8664357... ci: Add ubuntu lts 16.04 run with gcc
  a5f4d44... ci: Add ubuntu lts 18.04 run with gcc
  f73847e... ci: Add fedora rawhide run with clang
  9d7687d... ci: Switch image from fedora:rawhide to fedora:latest

Commits added to the branch:

  1430c46... Add boolean CodeContext.keep_going and corresponding compil (*)
  c0e44e4... json-glib-1.0: Change abstract methods of Serializable to v (*)
  a173c6e... genie: Creation methods should not be static (*)
  d4f1dd4... tests: Add regression test for genie struct construction (*)
  4e695a4... vala: Exclude nullable simple-type structs from gobject-pro (*)
  d144372... libvaladoc: Don't traverse into close circles with parent (*)
  fc2e7a3... ci: Add .gitlab-ci.yml
  96cb4e5... ci: Always deploy
  39ee886... ci: Add ubuntu lts 16.04 run with gcc
  e0b2206... ci: Add ubuntu lts 18.04 run with gcc
  7ff82f7... ci: Add fedora rawhide run with clang
  3b7af54... ci: Switch image from fedora:rawhide to fedora:latest

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