add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally computed
sha256 330dafa58d37a585a866167bc33f8fbe06dbcfc9a69cad43fab0b6702ebf2393  libg7221-dbfc29d4806ecdace50379a2f4d68a992a6fec34.tar.gz