add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally calculated
sha256    cf263ece9b50a78a7fb2277e3546fbbf0bf6858f41821932d92f2e3d8a065091  lpty-1.0.1-1.src.rock