[vala] (15 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:

  2766f77... coverage: Build gidl-bindings
  6085d26... ci: Add .gitlab-ci.yml
  f04072f... ci: Add ubuntu:16.04 run with gcc
  0111426... ci: Add ubuntu:18.04 run with gcc
  b8415e2... ci: Add fedora:rawhide run with clang
  8964493... ci: Add archlinux/base:latest run with gcc
  0f9e9e7... ci: archlinux/bison - https://bugs.archlinux.org/task/64165
  3ce4e9e... ci: Always deploy

Commits added to the branch:

  bb6fa87... libvaladoc: Support exporting the `class` modifier on metho (*)
  0746be6... libvaladoc: Support exporting the `class` modifier on field (*)
  72afa64... vala: Fix code indentation (*)
  df001da... girparser: Warn about conflicting signals and properties (*)
  0006f34... gtk4: Resolve conflict of DropTarget.drop signal with prope (*)
  06cfb12... gtk+-3.0: Resolve conflicts of signals with properties (*)
  31c255d... tests: Fix "methods/extern" test with -Werror=address and g (*)
  e1b95fb... coverage: Build gidl-bindings
  7de1c11... ci: Add .gitlab-ci.yml
  8ebf609... ci: Add ubuntu:16.04 run with gcc
  205a711... ci: Add ubuntu:18.04 run with gcc
  0e99da5... ci: Add fedora:rawhide run with clang
  1371768... ci: Add archlinux/base:latest run with gcc
  be6eec3... ci: archlinux/bison - https://bugs.archlinux.org/task/64165
  4f2b5b4... ci: Always deploy

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