list-targets subaction #1408

Job	Run time
bake (default)	19s
bake (release)	20s
error-check	5s
docker-config-malformed	6s
error-msg	7s
group	15s
provenance	22s
proxy-buildkitd	18s
provenance (mode=max)	20s
proxy-docker-config	17s
provenance (builder-id=foo)	11s
provenance (false)	9s
sbom (image, type=image,name=localhost:5000/name/app:latest,push=true)	30s
provenance (true)	14s
sbom (binary, /tmp/bake-build)	22s
set	46s
standalone	13s
source	1m 58s
	6m 52s

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