build

CI: allow manual workflow dispatches to run #3281

Job	Run time
default (gcc, release)	56s
default (clang, debug)	53s
default (clang, release)	53s
cross (s390x)	53s
default (gcc, debug)	49s
cross (ppc64le)	48s
cross (armhf)	52s
muon minimal static	32s
fallback shared libraries	0s
make static	38s
build libnvme and nvme-cli separately	41s
	7m 55s

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