[vala] (11 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:

  3f8623e... coverage: Build gidl-bindings
  39f2459... ci: Add .gitlab-ci.yml
  f55dae7... ci: Add ubuntu:16.04 run with gcc
  344bc2f... ci: Add ubuntu:18.04 run with gcc
  a72f8e8... ci: Add fedora:latest run with clang
  e293d58... ci: Add archlinux/base:latest run with gcc
  cf1ca16... ci: archlinux/bison - https://bugs.archlinux.org/task/64165
  8386d4a... ci: Always deploy

Commits added to the branch:

  7850210... vala: Infer target_type in coalescing expressions (*)
  6cfa112... vala: Non-nullable value-type in coalesce expression needs  (*)
  6f673c2... vala: Fix short-circuiting behavior of coalescing operator (*)
  55e1ee6... coverage: Build gidl-bindings
  0656c31... ci: Add .gitlab-ci.yml
  f3ef8bb... ci: Add ubuntu:16.04 run with gcc
  29d9efe... ci: Add ubuntu:18.04 run with gcc
  0c70014... ci: Add fedora:latest run with clang
  de9117a... ci: Add archlinux/base:latest run with gcc
  99d69ea... ci: archlinux/bison - https://bugs.archlinux.org/task/64165
  1f4af41... ci: Always deploy

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