add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256 1a9dd4429e4bb4929dcb438f9591a3625bc8cc161f840b5f843d8b1d2c8dcfe5  json-javascript-3d7767b6b1f3da363c625ff54e63bbf20e9e83ac.tar.gz