Pinwheel's sshd had no way to accept keys from other hosts. Give it the same `authorizedKeysCommand` setup as backwards and manatee, and authorize a new `alex.backwards-pinwheel` key that backwards uses for `ssh pinwheel`.
Pinwheel's sshd had no way to accept keys from other hosts. Give it the same `authorizedKeysCommand` setup as backwards and manatee, and authorize a new `alex.backwards-pinwheel` key that backwards uses for `ssh pinwheel`.