add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256 28a5928cf2e4fd79fa9a9aceaef5ebf1dccb1146489b7de4c2726f561700f01c  luajson-1.3.4-1.src.rock