increase short commit hash length to 12 for uniqueness #6886

Job	Run time
bake	21s
custom-labels-annotations	7s
docker-push	28s
flavor	6s
global-exps	12s
images	9s
json	8s
multi-images	7s
sep-tags ( )	6s
sep-tags (,)	16s
tag-match (\d.\d.\d, 0)	11s
tag-schedule	9s
tag-match (\d.\d, 0)	6s
tag-schedule (cron-{{date 'YYYYMMDD'}})	6s
tag-match (v(.*), 1)	14s
tag-schedule ({{date 'YYYYMMDD-HHmmss'}})	11s
tag-semver (auto)	6s
bake-annotations	17s
tag-schedule (schedule)	6s
tag-semver (true)	6s
bake-cwd	21s
tag-semver (false)	6s
no-images	10s
output-env	20s
sha-short	6s
sha-short (16)	9s
	4m 44s

Provide feedback