add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# Locally calculated after checking pgp signature
sha256    f4a245b94124b377d8b49646bf421f9155d36aa7614b6ebf83705d3ffc76eaad    which-2.21.tar.gz