add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256 bff39692fd2ac3590fd814aa1b1ca33e5d5971092955309aa8424b02b88ce1a3  valua-0.3-1.src.rock