[gnome-shell] (10 commits) Non-fast-forward update to branch wip/fmuellner/more-ci

[Florian Müllner <fmuellner src gnome org>]

The branch 'wip/fmuellner/more-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:

  c6b450b... ci: Skip source_check stage when appropriate
  1a22dd6... ci: Add build stage
  9f03b63... ci: Add test stage
  f3d429c... ci: Check that pot file is generated correctly
  b3aa5b5... ci: Use custom image for JS checks

Commits added to the branch:

  382282b... README.md: Add contribution section (*)
  27d0d9f... gitlab-ci.yml: Add check for issue or MR URL (*)
  baed951... Update Scottish Gaelic translation (*)
  8490173... Update Indonesian translation (*)
  bbd6862... ctrlAltTab: Fix more fallout from ES6 classes (*)
  2d40079... ci: Skip source_check stage when appropriate
  e177502... ci: Add build stage
  5be8185... ci: Add test stage
  00f5fc8... ci: Check that pot file is generated correctly
  ac840b7... ci: Use custom image for JS checks

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