[gjs: 2/2] Merge branch 'iwyu-image' into 'master'

[Philip Chimento <pchimento src gnome org>]

commit 4ebe22275873bf3488e07c8279d08cd499d2d982
Merge: 856b494e 472f94b5
Author: Philip Chimento <philip chimento gmail com>
Date:   Wed Jun 3 21:58:26 2020 +0000

    Merge branch 'iwyu-image' into 'master'
    
    CI: Add include-what-you-use to the debug CI image
    
    See merge request GNOME/gjs!448

 .gitlab-ci.yml              |  3 +-
 test/extra/Dockerfile.debug | 77 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 78 insertions(+), 2 deletions(-)
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