Build

docs: add plans/ directory for design and implementation plans #4410

Job	Run time
make static	43s
musl libc build on Debian	37s
windows-msys2-ucrt64	1m 51s
musl libc minimal static build on Debian	34s
libnvme (debian, gcc, release)	52s
musl libc build on Alpine	38s
cross (s390x)	43s
cross (ppc64le)	44s
build libnvme and nvme-cli separately	43s
muon minimal static	34s
cross (armhf)	40s
nvme-cli (fedora, gcc, debug)	50s
nvme-cli (debian, clang, release)	1m 4s
nvme-cli (fedora, clang, release)	1m 0s
nvme-cli (tumbleweed, clang, release)	57s
nvme-cli (debian, gcc, release)	1m 5s
nvme-cli (tumbleweed, gcc, debug)	54s
nvme-cli (debian, gcc, debug)	59s
nvme-cli (fedora, clang, debug)	50s
nvme-cli (tumbleweed, gcc, release)	1m 19s
nvme-cli (fedora, gcc, release)	1m 0s
nvme-cli (debian, clang, debug)	54s
nvme-cli (tumbleweed, clang, debug)	53s
fallback shared libraries	0s
	20m 24s

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