ls: format opt #2980

Job	Run time
buildkit-edge	1m 32s
prepare-binaries	6s
prepare-test	1m 23s
binaries (darwin/amd64)	1m 22s
binaries (darwin/arm64)	1m 32s
binaries (linux/amd64)	1m 26s
binaries (linux/arm/v6)	1m 26s
binaries (linux/arm/v7)	1m 30s
binaries (linux/arm64)	1m 21s
binaries (linux/ppc64le)	1m 32s
binaries (linux/riscv64)	1m 32s
binaries (linux/s390x)	1m 28s
binaries (windows/amd64)	1m 32s
binaries (windows/arm64)	1m 29s
test (docker, ./tests)	3m 8s
test (docker\+containerd, ./tests)	3m 5s
test (docker-container, ./tests)	2m 27s
test (remote, ./tests)	2m 16s
test (./..., 1)	2m 59s
release	18s
bin-image	0s
	33m 24s

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