gitlab-ci: check generated config files

Use the script added by the previous patch to check
generated config files.

Tested on gitlab:
https://gitlab.com/kubu93/buildroot/pipelines/137597966

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

support/misc/gitlab-ci.yml.in

@@ -38,6 +38,7 @@ check-package:
     script:
         - echo "Configure Buildroot for ${DEFCONFIG_NAME}"
         - make ${DEFCONFIG_NAME}
+        - ./support/scripts/check-dotconfig.py .config ./configs/${DEFCONFIG_NAME}
         - echo 'Build buildroot'
         - |
             make > >(tee build.log |grep '>>>') 2>&1 || {