add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256    b19854c685337ddcec2fe9c22113d2cd14715d52ccd2676abe2fa49b61a2ec4d  lunit-0.5-2.src.rock