Hi,

would be nice if mmdebstrap-autopkgtest-build-qemu would validate that the file
passed via --sshkey= is a pubkey, and maybe even checking if the key type is
supported by the release being built.

In my case I accidentally tabcompleted to the private key, and that got added to
/root/.ssh/authorized_keys, which of course won't let me log in.

Greets,
Lee