Feed coreboot git tree with results

[tlaurion]

https://review.coreboot.org/c/coreboot/+/32237

[miczyg1]

We could do so, e.g. for no-payload default config builds, and report the open-source % of the coreboot build? However, if no IFD is included, then this is becoming hard Dasharo/dasharo-issues#461

[pietrushnic]

@macpijan there should be some synergy with Fobanil SBOM/RIM here.