Manage apt repository keys
Add possibility to add apt repo keys to installation nfsroots via /etc/fai/apt/keys/ and /etc/fai/flavors/[flavor]/apt/keys/
Also requires the addition of gnupg to the nfsroot via debootstrap:
FAI_DEBOOTSTRAP_OPTS='[…] --include=gnupg'
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information