Investigate caddy L2 to proxy buildkitd

[dubo-dubon-duponey]

• https://github.com/inetaf/tcpproxy/blob/master/cmd/tlsrouter/README.md
• https://github.com/mholt/caddy-l4
• https://github.com/caddyserver/caddy/issues/2879
• Maybe envoy as well

[dubo-dubon-duponey]

Looking into ghost