add .well-known section including a note that this is not effective for the local dev environment

backend/tls_localhost_nginx.conf

@@ -9,6 +9,18 @@ server {
     ssl_certificate         /root/ssl/cert.pem;
     ssl_certificate_key     /root/ssl/key.pem;
 
+    # well-known config adding rtc_foci backend
+    # Note well-known is currently not effective due to:
+    # https://spec.matrix.org/v1.12/client-server-api/#well-known-uri the spec
+    # says it must be at https://$server_name/... (implied port 443) Hence, we
+    # currently rely for local development environment on depricated config.json
+    # setting for livekit_service_url
+    location /.well-known/matrix/client {
+        return 200 '{"m.homeserver": {"base_url": "http://synapse.localhost:8008"}, "org.matrix.msc4143.rtc_foci": [{"type": "livekit", "livekit_service_url": "http://localhost:8080"}]}';
+        default_type application/json;
+        add_header Access-Control-Allow-Origin *;
+    }
+
     # Reverse proxy for Matrix Synapse Homeserver
     # This is also required for development environment.
     # Reason: the lk-jwt-service uses the federation API for the openid token