build

debug: Add `buildx debug` command #2715

Job	Run time
buildkit-edge	1m 58s
prepare-test	2m 47s
prepare-binaries	8s
binaries (darwin/amd64)	2m 23s
binaries (darwin/arm64)	2m 23s
binaries (linux/amd64)	2m 21s
binaries (linux/arm/v6)	3m 4s
binaries (linux/arm/v7)	2m 22s
binaries (linux/arm64)	2m 13s
binaries (linux/ppc64le)	2m 28s
binaries (linux/riscv64)	2m 25s
binaries (linux/s390x)	2m 15s
binaries (windows/amd64)	2m 10s
binaries (windows/arm64)	2m 9s
test (docker, ./tests)	2m 23s
test (docker\+containerd, ./tests)	2m 23s
test (docker-container, ./tests)	2m 22s
test (remote, ./tests)	2m 23s
test (./..., 1)	2m 23s
bin-image	1s
release	1s
	43m 2s

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