add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed
sha256  53762ed9b8a2edfcc5b4c535ef73e6a425f2577e036bb15994ca16a39b16ebab  lua-periphery-1.0.6-1.src.rock