Fix server crashes: tcmalloc and workshop collection issues

- Add automatic tcmalloc disable in start scripts to prevent 'large alloc' segfaults
- Add warnings and documentation about workshop COLLECTION vs addon IDs
- Expand troubleshooting section with solutions for common crashes
- Document that -authkey deprecation warning can be safely ignored

Fixes:
- tcmalloc: large alloc XXXXXXX bytes == (nil) followed by Segmentation fault
- Item is not a collection! error when using addon ID instead of collection ID
- Missing 32-bit libraries warning with installation instructions

scripts/docker-entrypoint.sh

@@ -150,9 +150,13 @@ if [[ -n "$RCON_PASSWORD" && "$RCON_PASSWORD" != "changeme" ]]; then
 fi
 
 # Add workshop collection if provided
+# NOTE: Make sure WORKSHOP_COLLECTION is a COLLECTION ID, not an individual item ID!
+# You can verify at: https://steamcommunity.com/sharedfiles/filedetails/?id=YOUR_ID
+# If it says "Collection" it's valid. If it says "Addon" it will fail.
 if [[ -n "$WORKSHOP_COLLECTION" ]]; then
     ARGS="$ARGS +host_workshop_collection $WORKSHOP_COLLECTION"
     log_info "Workshop collection: $WORKSHOP_COLLECTION"
+    log_warning "Ensure this is a Collection ID, not an individual addon ID!"
 fi
 
 # Display configuration
@@ -182,15 +186,21 @@ trap cleanup SIGTERM SIGINT
 # Add -disableluarefresh to prevent lua refresh issues
 ARGS="$ARGS -disableluarefresh"
 
-# Disable tcmalloc which causes issues in Docker environments
+# Disable tcmalloc which causes segfaults with large memory allocations in Docker
 # This is a known issue with Source engine games in containers
-# Override the tcmalloc library with standard glibc malloc
+# The error "tcmalloc: large alloc XXXXXXX bytes == (nil)" indicates memory allocation failure
 export LD_PRELOAD=""
 unset LD_PRELOAD
 
 # Use the included 32-bit glibc directly
 export LD_LIBRARY_PATH="$SERVER_DIR/bin:$LD_LIBRARY_PATH"
 
+# Disable tcmalloc by renaming the library if it exists (fallback to system malloc)
+if [[ -f "$SERVER_DIR/bin/libtcmalloc_minimal.so.4" ]]; then
+    log_info "Disabling tcmalloc to prevent memory allocation crashes..."
+    mv "$SERVER_DIR/bin/libtcmalloc_minimal.so.4" "$SERVER_DIR/bin/libtcmalloc_minimal.so.4.disabled" 2>/dev/null || true
+fi
+
 # Start the server directly (not via srcds_run to avoid script issues)
 cd "$SERVER_DIR"
 exec ./srcds_linux $ARGS -norestart -nohltv -condebug