[relay] Feature/relay integration (#2244)

This update adds new relay integration for NetBird clients. The new relay is based on web sockets and listens on a single port.

- Adds new relay implementation with websocket with single port relaying mechanism
- refactor peer connection logic, allowing upgrade and downgrade from/to P2P connection
- peer connections are faster since it connects first to relay and then upgrades to P2P
- maintains compatibility with old clients by not using the new relay
- updates infrastructure scripts with new relay service

infrastructure_files/setup.env.example

@@ -7,6 +7,7 @@ NETBIRD_DASHBOARD_TAG=""
 NETBIRD_SIGNAL_TAG=""
 NETBIRD_MANAGEMENT_TAG=""
 COTURN_TAG=""
+NETBIRD_RELAY_TAG=""
 
 # Dashboard domain. e.g. app.mydomain.com
 NETBIRD_DOMAIN=""
@@ -91,3 +92,14 @@ NETBIRD_LETSENCRYPT_EMAIL=""
 NETBIRD_DISABLE_ANONYMOUS_METRICS=false
 # DNS DOMAIN configures the domain name used for peer resolution. By default it is netbird.selfhosted
 NETBIRD_MGMT_DNS_DOMAIN=netbird.selfhosted
+
+# -------------------------------------------
+# Relay settings
+# -------------------------------------------
+# Relay server domain. e.g. relay.mydomain.com
+# if not specified it will assume NETBIRD_DOMAIN
+NETBIRD_RELAY_DOMAIN=""
+
+# Relay server connection port. If none is supplied
+# it will default to 33080
+NETBIRD_RELAY_PORT=""