https://github.com/systemd/systemd/pull/32941
added support for firecracker/cloud-hypervisor and
their unix-domain socket to AF_VSOCK multiplex.
but I forgot to add the pattern in the ssh config drop-in.
fix it now!
# Make sure unix/* and vsock/* can be used to connect to AF_UNIX and AF_VSOCK paths.
# Make sure machine/* can be used to connect to local machines registered in machined.
#
-Host unix/* vsock/* machine/*
+Host unix/* vsock/* vsock-mux/* machine/*
ProxyCommand {{LIBEXECDIR}}/systemd-ssh-proxy %h %p
ProxyUseFdpass yes
CheckHostIP no