build

doc: add opcode description as mandatory #2994

Job	Run time
cross (armhf)	40s
cross (s390x)	41s
fallback shared libraries	1m 25s
default (clang, release)	33s
default (gcc, release)	33s
cross (ppc64le)	41s
default (clang, debug)	26s
muon minimal static	29s
default (gcc, debug)	24s
build libnvme and nvme-cli separately	36s
make static	1m 36s
	8m 4s

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