custom annotations support #6405

Job	Run time
multi-images	5s
tag-match (\d.\d.\d, 0)	4s
tag-schedule	4s
tag-match (\d.\d, 0)	5s
tag-semver (auto)	3s
tag-match (v(.*), 1)	5s
tag-semver (true)	4s
tag-schedule (cron-{{date 'YYYYMMDD'}})	4s
tag-semver (false)	3s
bake	19s
tag-schedule ({{date 'YYYYMMDD-HHmmss'}})	5s
tag-schedule (schedule)	3s
bake-annotations	23s
docker-push	26s
flavor	5s
global-exps	3s
images	5s
json	4s
labels	3s
no-images	3s
output-env	9s
sep-tags ( )	3s
sep-tags (,)	6s
	2m 34s

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