flowey: support RPM-based Linux distributions #145

Job	Run time
build and check docs [x64-windows]	4m 50s
build mdbook guide [x64-windows]	4m 50s
build artifacts [x64-linux]	1m 8s
build openhcl [aarch64-linux]	1m 5s
clippy [windows], unit tests [x64-windows]	4m 41s
build openhcl [x64-linux]	1m 3s
clippy [linux, macos], unit tests [x64-linux]	1m 3s
clippy [linux-musl, misc nostd], unit tests [x64-linux-musl]	1m 1s
test flowey local backend	58s
build and check docs [x64-linux]	1m 3s
xtask fmt (linux)	1m 0s
build artifacts (not for VMM tests) [aarch64-windows]	5m 37s
build artifacts (for VMM tests) [aarch64-windows]	5m 8s
build artifacts (not for VMM tests) [x64-windows]	5m 40s
build artifacts [aarch64-linux]	1m 25s
build artifacts (for VMM tests) [x64-windows]	7m 59s
xtask fmt (windows)	0s
run vmm-tests [x64-windows-intel]	0s
run vmm-tests [x64-windows-amd]	0s
run vmm-tests [x64-linux]	0s
openvmm checkin gates	0s
	48m 31s

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