Listen on unix socket

[fcoelho]

This is a feature request to make cloudflared have the ability to listen on unix sockets as well as host:port combinations. For example:

cloudflared access tcp --hostname my-tunnel-hostname.example.com --listener unix:///path/to/my.socket

Reason for this is to make it easier to identify services locally. I have a few TCP tunnels set up that I connect to occasionally, sometimes multiple at the same time. And keeping track of which services are running on which ports is not always exciting. It'd be easier if I could make cloudflared listen on a unix socket directly so it's easier to identify the service by path name

[guilhermef]

This would make it easier for us also.

[Weltolk]

This would make it easier for us also.

[comunidadio]

Would be nice to have. For the slight performance improvement but even more so for the security (simpler permission model and no port open)