Add SteamCMD platform type flag to fix installation

- Added +@sSteamCmdForcePlatformType linux to install and update scripts
- Added retry logic for failed installations

install.sh

@@ -119,11 +119,22 @@ install_gmod_server() {
     
     cd "$STEAMCMD_DIR"
     
-    ./steamcmd.sh +force_install_dir "$SERVER_DIR" \
+    # Force Linux platform and install
+    ./steamcmd.sh +@sSteamCmdForcePlatformType linux \
+        +force_install_dir "$SERVER_DIR" \
         +login anonymous \
         +app_update 4020 validate \
         +quit
     
+    if [[ $? -ne 0 ]]; then
+        log_warning "First attempt failed, retrying..."
+        ./steamcmd.sh +@sSteamCmdForcePlatformType linux \
+            +force_install_dir "$SERVER_DIR" \
+            +login anonymous \
+            +app_update 4020 \
+            +quit
+    fi
+    
     log_success "Garry's Mod server installed."
 }