add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256 dbbcb08c0e70713b0c920387a9967e5b30ef833c8118c847edbbca4f68ff0562 v0.5.5.tar.gz