add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally calculated after checking pgp signature
sha256    c9a18b0c760506d150017cdb1fa5c1cefe12b8dcbbf9a7e784eb75af376e96cd    libosip2-3.6.0.tar.gz