add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  5cb26e3e232cfc4a7cb16da432db532b775c5ebdb887ac9d39df5632f2c9a5e5  nanocom.tar.gz