[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:

  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

Commits added to the branch:

  453c81d... Slightly improve source_reference for get_dup_func_expressi (*)
  9572175... vala: Add support for null-safe access operator (*)
  3cccae9... coverage: Build gidl-bindings
  70c2060... ci: Add .gitlab-ci.yml
  c348af0... ci: Add ubuntu:16.04 run with gcc
  c78f534... ci: Add archlinux:latest run with gcc
  faf1aef... ci: Pin archlinux before glibc bump
  9147894... ci: Add alpine:edge run with gcc
  8d8466c... ci: Add fedora:rawhide run with clang
  bca0237... Fedora rawhide is broken
  0c275c7... ci: Always deploy

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