install: Debian sid/buster has no VERSION_ID, error out.
Error out if debian has no VERSION_ID, point user to stable
packages.
Fixes:
$ export DEBIAN_FRONTEND=noninteractive
$ ARCH=$(arch)
$ source /etc/os-release
+ $ [ "$ID" = debian ] && [ -z "$VERSION_ID" ] && echo >&2 "ERROR: Debian unstable not supported.
+ You can try stable packages here:
+ http://download.opensuse.org/repositories/home:/katacontainers:/releases:/${ARCH}:/master" && exit 1
$ sudo sh -c "echo 'deb http://download.opensuse.org/repositories/home:/katacontainers:/releases:/${ARCH}:/master/Debian_${VERSION_ID}/ /' > /etc/apt/sources.list.d/kata-containers.list"
$ curl -sL http://download.opensuse.org/repositories/home:/katacontainers:/releases:/${ARCH}:/master/Debian_${VERSION_ID}/Release.key | sudo apt-key add -
$ sudo -E apt-get update
