add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally calculated
sha256 c7214ea7503c3de1edf3bdd72b37187aa3a9a36d7cf7f5945a067ae8d262d3fb erlang-p1-iconv-1.0.6.tar.gz