[gnome-shell] ci: Turn on -Werror

[Florian Müllner <fmuellner src gnome org>]

commit 48b860b69f841ece6effd3f01ca39e93518e35ac
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Sep 10 16:02:44 2019 +0200

    ci: Turn on -Werror
    
    Now that all compiler warnings are fixed, let's try to keep it that
    way by making warnings fatal during CI.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/709

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index cedd587c52..03c7f9786b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -54,7 +54,7 @@ build:
         - meson mutter mutter/build --prefix=/usr -Dtests=false
         - ninja -C mutter/build install
     script:
-        - meson . build -Dbuiltype=debugoptimized -Dman=false
+        - meson . build -Dbuiltype=debugoptimized -Dman=false --werror
         - ninja -C build
         - ninja -C build install
     <<: *only_default