[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/docker-compose.yml.tmpl

@@ -49,6 +49,23 @@ services:
       options:
         max-size: "500m"
         max-file: "2"
+  # Relay
+  relay:
+    image: netbirdio/relay:$NETBIRD_RELAY_TAG
+    restart: unless-stopped
+    environment:
+    - NB_LOG_LEVEL=info
+    - NB_LISTEN_ADDRESS=:$NETBIRD_RELAY_PORT
+    - NB_EXPOSED_ADDRESS=$NETBIRD_RELAY_DOMAIN:$NETBIRD_RELAY_PORT
+    # todo: change to a secure secret
+    - NB_AUTH_SECRET=$NETBIRD_RELAY_AUTH_SECRET
+    ports:
+      - $NETBIRD_RELAY_PORT:$NETBIRD_RELAY_PORT
+    logging:
+      driver: "json-file"
+      options:
+        max-size: "500m"
+        max-file: "2"
 
   # Management
   management: