[vala] (18 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:

  ad9f05d... coverage: Build gidl-bindings
  124927a... ci: Add .gitlab-ci.yml
  aa4be90... ci: Add ubuntu:16.04 run with gcc
  664e03b... ci: Add archlinux:latest run with gcc
  e6d4b59... ci: Pin archlinux before glibc bump
  0b36c6b... ci: Add alpine:edge run with gcc
  c172cb5... ci: Add fedora:rawhide run with clang
  f721541... Fedora rawhide is broken
  5081d01... ci: Always deploy

Commits added to the branch:

  2848b53... vala: this_parameter property for subroutines is nullable (*)
  f25b5b1... girwriter: Add explicit writable attribute to all field ele (*)
  f3a8f1a... girparser: Never skip "function" elements (*)
  f00ba57... girparser: Add "move-to" value of functions as Version.repl (*)
  484c97c... girparser: Improve instance method detection (*)
  9d57089... Regenerate GIR-based bindings for improved instance method  (*)
  35b3b43... girwriter: Fix position of "result" parameter for struct co (*)
  4bc9381... girparser: Add support for "final" class attribute (*)
  7ebb25f... Add support for sealed classes (*)
  0ced799... coverage: Build gidl-bindings
  4cb8429... ci: Add .gitlab-ci.yml
  fc7a269... ci: Add ubuntu:16.04 run with gcc
  c6703c4... ci: Add archlinux:latest run with gcc
  6017c15... ci: Pin archlinux before glibc bump
  ed60d3d... ci: Add alpine:edge run with gcc
  696fd8b... ci: Add fedora:rawhide run with clang
  1279d5c... Fedora rawhide is broken
  8cad09e... ci: Always deploy

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