add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally computed
sha256 e10f0de1384d75e6fc210c53e91843f6110d6c4f3afbfb588130713c2f9d8fe8  libglfw-3.2.1.tar.gz