Can't connect to remote LXD containers

[rptb1]

lxd-tramp is great. Thank you.

However, I can't find a way to specify a remote container, such as 'foo:bar', that is, a container named bar at an LXD remote named foo, which I can reach from the command line with lxc exec foo:bar -- bash --login.

I can't find a syntax that allows me to tell Tramp mode to accept a "host name" containing a colon.

Either:

1. There is a secret way to escape a colon in a Tramp path, and it would be good to document that here.
2. lxd-tramp could provide an escape or alternative syntax.

Thanks.