fix: fix docker build

Author: wudidapaopao

mcp_clickhouse/mcp_server.py

@@ -316,14 +316,14 @@ def _init_chdb_client():
 
 
 # Register tools based on configuration
-if get_config().enabled:
+if os.getenv("CLICKHOUSE_ENABLED", "true").lower() == "true":
     mcp.add_tool(list_databases)
     mcp.add_tool(list_tables)
     mcp.add_tool(run_select_query)
     logger.info("ClickHouse tools registered")
 
 
-if get_chdb_config().enabled:
+if os.getenv("CHDB_ENABLED", "false").lower() == "true":
     _chdb_client = _init_chdb_client()
     if _chdb_client:
         atexit.register(lambda: _chdb_client.close())