add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256    aa7883a0d44f500e32ef306c04632546f97f33159fffa7bcdc3f451170f95896  luaexpat-1.3.0-1.src.rock