[vala] (19 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:

  1dfd4bc... coverage: Build gidl-bindings
  3f7442f... ci: Add .gitlab-ci.yml
  b21adc3... ci: Add ubuntu:16.04 run with gcc
  fc08bbf... ci: Add ubuntu:18.04 run with gcc
  d90c6b7... ci: Add fedora:rawhide run with clang
  8f6cee5... ci: Add archlinux/base:latest run with gcc
  d1af667... ci: archlinux/bison - https://bugs.archlinux.org/task/64165
  42e59ee... ci: Add alpine:edge run with gcc
  db55209... ci: Always deploy

Commits added to the branch:

  fdfa8f3... Sync NEWS from 0.50 (*)
  382a296... vala: Improve detection of duplicate package source files (*)
  5db0ee1... webkit2gtk-4.0: Update to 2.31.1 (*)
  34e96b7... girparser: Handle anonymous delegate not backed by virtual- (*)
  f61cca4... girparser: Minor improvement to field getter detection (*)
  0b136b2... gdk-pixbuf-2.0: Update to 2.42.3~ (*)
  355eb36... Regenerate GIR-based bindings (*)
  de7a22e... glib-2.0: Improve type of OptionEntry.flags field (*)
  8a7496b... libvaladoc: Fix typos copyright year (*)
  57b8d77... libvaladoc/html: Don't sort struct fields to keep their ori (*)
  cd36e6a... coverage: Build gidl-bindings
  f3dc453... ci: Add .gitlab-ci.yml
  42febab... ci: Add ubuntu:16.04 run with gcc
  7d66b66... ci: Add ubuntu:18.04 run with gcc
  07db5d5... ci: Add fedora:rawhide run with clang
  9ca3110... ci: Add archlinux/base:latest run with gcc
  4de1fb6... ci: archlinux/bison - https://bugs.archlinux.org/task/64165
  2e0d27b... ci: Add alpine:edge run with gcc
  7fcb06a... ci: Always deploy

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