add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# Locally computed:
sha256  7e6636e400856984c4405ce7bd0843aaa3329fa3efd20c58df8400a9eaa35f09  empty-0.6.20b.tgz