Fix Docker setup - download GMod at runtime

- Dockerfile now only installs SteamCMD, server downloaded on first run
- Entrypoint handles full server installation including addons
- Fixed volume configuration for persistence
- Added AUTO_UPDATE environment variable

docker/docker-compose.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   gmod-prophunt:
     build:
@@ -19,6 +17,7 @@ services:
       - WORKSHOP_COLLECTION=${WORKSHOP_COLLECTION:-}
       - TICKRATE=${TICKRATE:-66}
       - TZ=${TZ:-America/Los_Angeles}
+      - AUTO_UPDATE=${AUTO_UPDATE:-true}
     
     ports:
       - "${PORT:-27015}:27015/tcp"
@@ -27,11 +26,8 @@ services:
       - "27020:27020/udp"
     
     volumes:
-      # Persistent data
-      - gmod-data:/home/gmod/serverfiles/garrysmod/data
-      - gmod-addons:/home/gmod/serverfiles/garrysmod/addons
-      # Config can be bind-mounted for easy editing
-      - ./cfg:/home/gmod/serverfiles/garrysmod/cfg:ro
+      # Persistent server files (includes addons, data, configs)
+      - gmod-server:/home/gmod/serverfiles
     
     networks:
       - gmod-network
@@ -58,5 +54,4 @@ networks:
     driver: bridge
 
 volumes:
-  gmod-data:
-  gmod-addons:
+  gmod-server: