Merge pull request #358 from crazy-max/empty-images #6398

Job	Run time
images	3s
global-exps	5s
flavor	5s
json	4s
labels	7s
multi-images	6s
tag-match (\d.\d.\d, 0)	6s
tag-match (\d.\d, 0)	5s
tag-schedule	12s
tag-semver (auto)	4s
tag-match (v(.*), 1)	6s
tag-schedule (cron-{{date 'YYYYMMDD'}})	5s
tag-semver (true)	5s
tag-schedule ({{date 'YYYYMMDD-HHmmss'}})	6s
tag-semver (false)	5s
tag-schedule (schedule)	12s
bake	11s
docker-push	1m 15s
bake-annotations	12s
no-images	7s
output-env	15s
sep-tags ( )	6s
sep-tags (,)	20s
	4m 2s

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