Request: Publish the Secure Boot DB and KEK certificates

[benjarobin]

@DHowett

In the interim, I’ve published the certificates as extracted from the dbDefault and KEKDefault secure boot variables

If sbctl tool is used, this is no longer necessary, since sbctl can now enroll builtin firmware keys. We just have to do these steps:

• Enter secure boot setup mode. See Secureboot setup mode - #25 by ROBIN_Benjamin
• Enroll your own keys (including Microsoft keys and Framework firmware keys) using sbctl enroll-keys -m -f