add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally calculated after checking pgp signature
sha256    db0bd8cdec329b48f53a6f00199c92d5ba40b0f015b153718d1b15d3d967fbca    neon-0.30.2.tar.gz