add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally computed
sha256 dfc85571ad86a071bf7a0db7cadf97a870e628777e47176520de6866b4f042b6 uhubctl-047bb1e392efd3e0ea5d5caf351e20761e12cd44.tar.gz