add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256    ccc971298db70963d3f13766c3246a3c36ae7e388acfab7ba2180149d9c8c64f  mongoose-6.7.tar.gz