add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256    c2fa09f9a49d8b319e79638e49e967c682df8726006e03059b1ffca5ab82099c    startup-notification-0.9.tar.gz