Add Telebit Docker Compose setup

.env.example

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+# Build source for https://github.com/therootcompany/telebit.
+TELEBIT_REF=master
+
+# Host port published by Docker. Point external nginx upstreams here.
+TELEBIT_PORT=8085
+
+# Base domain assigned to devices, for example: device-a.devices.example.com.
+DOMAIN=devices.example.com
+
+# Public hostname clients use for the websocket tunnel.
+TUNNEL_DOMAIN=tunnel.example.com
+
+# Public hostname for the management API.
+MGMT_DOMAIN=mgmt.devices.example.com
+
+# Shared JWT secret for relay and management. Use at least 16 random chars.
+SECRET=change-me-to-a-long-random-secret
+
+# Internal postgres password.
+POSTGRES_PASSWORD=change-me-postgres-password
+
+VERBOSE=true