[mutter] (3 commits) Non-fast-forward update to branch gbsneto/expose-framebuffer-for-introspection

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

The branch 'gbsneto/expose-framebuffer-for-introspection' 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:

  546812a... cogl/framebuffer: Mark CoglOffscreen as a CoglFramebuffer i
  e7979b1... cogl: Expose more headers for introspection

Commits added to the branch:

  a8e9f46... Add .gitlab-ci.yml for build testing (*)
  93e20cf... cogl/framebuffer: Mark CoglOffscreen as a CoglFramebuffer i
  4ce4a2b... cogl: Expose more headers for introspection

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