Build

build: add dedicated docs target #4107

Job	Run time
muon minimal static	35s
build libnvme and nvme-cli separately	40s
cross (ppc64le)	38s
cross (armhf)	39s
musl libc build on Debian	32s
musl libc build on Alpine	44s
libnvme (debian, gcc, release)	47s
musl libc minimal static build on Debian	28s
cross (s390x)	45s
make static	43s
nvme-cli (fedora, gcc, release)	57s
nvme-cli (debian, gcc, debug)	52s
nvme-cli (debian, gcc, release)	57s
nvme-cli (debian, clang, release)	1m 5s
nvme-cli (tumbleweed, clang, release)	1m 2s
nvme-cli (fedora, gcc, debug)	45s
nvme-cli (tumbleweed, gcc, debug)	49s
nvme-cli (debian, clang, debug)	52s
nvme-cli (fedora, clang, release)	45s
nvme-cli (tumbleweed, clang, debug)	57s
nvme-cli (tumbleweed, gcc, release)	1m 17s
nvme-cli (fedora, clang, debug)	40s
fallback shared libraries	0s
	17m 29s

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