build

CI: allow manual workflow dispatches to run #3282

Job	Run time
default (gcc, release)	55s
default (gcc, debug)	52s
cross (armhf)	45s
fallback shared libraries	1m 22s
cross (s390x)	1m 2s
cross (ppc64le)	43s
default (clang, release)	52s
make static	37s
default (clang, debug)	45s
muon minimal static	32s
build libnvme and nvme-cli separately	44s
	9m 9s

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