Merge branch 'mnowak/suppress-gitlab-clean-up-output' into 'main'

Suppress Git clean output in GitLab CI

See merge request isc-projects/bind9!7702

Author: Mno-hime

.gitlab-ci.yml

@@ -8,6 +8,7 @@ variables:
   CCACHE_DIR: "/ccache"
 
   GIT_DEPTH: 1
+  GIT_CLEAN_FLAGS: -ffdxq
 
   # The following values may be overwritten in GitLab's CI/CD Variables Settings.
   BUILD_PARALLEL_JOBS: 6