test-snapd-ovmf

Build of OVMF firmware with enrolled test keys for use in snapd CI.
This snap contains:
- fw/

 - OVMFCODE.fd: Firmware

 - OVMFVARS.fd: Non volatile memory for setup mode (secure boot is disabled but can be enabled).

 - OVMF_VARS.enrolled.fd. Non volatile memory with test keys enrolled.

- secboot/

 - PK.{key,crt}: platform key

 - KEK.{key,crt}: key exchange key

 - DB.{key,crt}: main key

The keys that are enrolled are:
- The PK, KEK and DB from secboot/
- The deprecated snakeoil key used to sign development builds
- The kernel keys for edge channels
- The Microsoft MicCorKEK and MicCorUEFCA keys
- An initial dbx which contains just a throw-away key