add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256    7a6c4142b0096106f498d7ee4bea5bf5086c076d1f071893441b8e5c0665fb47  ljlinenoise-0.1.3-1.src.rock