build

Permit '=' separator and '[ipv6]' in --add-host #2961

Job	Run time
buildkit-edge	1m 17s
prepare-binaries	5s
prepare-test	1m 39s
binaries (darwin/amd64)	1m 30s
binaries (darwin/arm64)	1m 27s
binaries (linux/amd64)	1m 35s
binaries (linux/arm/v6)	1m 19s
binaries (linux/arm/v7)	1m 23s
binaries (linux/arm64)	1m 32s
binaries (linux/ppc64le)	1m 28s
binaries (linux/riscv64)	1m 39s
binaries (linux/s390x)	1m 33s
binaries (windows/amd64)	1m 32s
binaries (windows/arm64)	1m 38s
test (docker, ./tests)	3m 16s
test (docker\+containerd, ./tests)	3m 14s
test (docker-container, ./tests)	2m 45s
test (remote, ./tests)	2m 28s
test (./..., 1)	3m 5s
release	25s
bin-image	0s
	34m 50s

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