ci: pre-collapse GitLab CI sections

Sections of CI output defined by `begin_group()` and `end_group()` are
expanded in GitLab pipelines by default. This can make CI job output
rather noisy and harder to navigate. Update the behavior for GitLab
pipelines to now collapse sections by default.

Signed-off-by: Justin Tobler <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: jltobler

ci/lib.sh

@@ -18,7 +18,7 @@ elif test true = "$GITLAB_CI"
 then
 	begin_group () {
 		need_to_end_group=t
-		printf "\e[0Ksection_start:$(date +%s):$(echo "$1" | tr ' ' _)\r\e[0K$1\n"
+		printf "\e[0Ksection_start:$(date +%s):$(echo "$1" | tr ' ' _)[collapsed=true]\r\e[0K$1\n"
 		trap "end_group '$1'" EXIT
 		set -x
 	}