needs udeb install script
this udeb doesn't actually install the devuan-keyring.gpg file.
Add debian/devuan-keyring-udev.install containing:
/usr/share/keyrings/devuan-keyring.gpg
for ref see https://sources.debian.net/src/debian-archive-keyring/2014.3/debian/debian-archive-keyring-udeb.install/
