add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally computed
sha256 0262a7023f8b12bcacfb0b25e69b2a63291f944f7683d54d8f33d4b2ca556844 xen-4.10.0.tar.gz