[vala] (13 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:

  03e641f... coverage: Build gidl-bindings
  52e927e... ci: Add .gitlab-ci.yml
  262ae8b... ci: Add ubuntu:16.04 run with gcc
  e0dc22d... ci: Add ubuntu:18.04 run with gcc
  f6ff8b9... ci: Add fedora:latest run with clang
  1e739ef... ci: Add archlinux/base:latest run with gcc
  7bcf0aa... ci: archlinux/bison - https://bugs.archlinux.org/task/64165
  884c025... ci: Always deploy

Commits added to the branch:

  c16b665... Add support for sealed classes in bindings (*)
  e4c8230... vala: Method representing a LambdaExpression might be null  (*)
  5dad5b3... vala: Prevent possible stack-overflow in Class.is_compact/i (*)
  4051272... vapi: Add some fundamental deps files (*)
  a655203... tests: Add invalid "return" tests to increase coverage (*)
  24c50ec... coverage: Build gidl-bindings
  247fffe... ci: Add .gitlab-ci.yml
  890e8d0... ci: Add ubuntu:16.04 run with gcc
  d35ac12... ci: Add ubuntu:18.04 run with gcc
  a41c33e... ci: Add fedora:latest run with clang
  30fc2bd... ci: Add archlinux/base:latest run with gcc
  5b9771b... ci: archlinux/bison - https://bugs.archlinux.org/task/64165
  14e9e44... ci: Always deploy

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