add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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root::0:0:root:/home/root:/bin/sh
pseudopasswd:*:1:1:this-is-the-pseudo-passwd:/nonexistent:/bin/sh
nobody:*:65534:65534:nobody:/nonexistent:/bin/sh