add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# sha256 locally computed
sha256 f4cb17b21928e36ec27de5c5294dea6ec1de4acd7ee6c56d6ecc75319cbcaefa systemd-bootchart-233.tar.xz