added path variable

.env.example

@@ -0,0 +1,17 @@
+# Copy to .env (next to docker-compose.yml) and adjust. Docker Compose reads .env automatically.
+
+# Full URL the browser uses to reach the game hub through the reverse proxy.
+# Empty = "<website origin>/hub".
+SERVER_URL=https://game.example.com/server/hub
+
+# Prefix the game server should accept when the proxy forwards its sub-path without
+# stripping it (e.g. /server). Leave empty if the proxy strips the prefix.
+PATH_BASE=
+
+# Comma separated origins allowed to connect to the hub. Empty = allow any origin.
+ALLOWED_ORIGINS=https://game.example.com
+
+# Optional gameplay tuning, passed to the server as Game__<Setting> (see GameSettings.cs).
+# Add these under the server's "environment:" in docker-compose.yml to use them.
+# Game__ItemSpawnChance=0.1
+# Game__CountdownSeconds=3