add versions to snakes and read it in server class

server/Server.py

@@ -17,6 +17,7 @@ class Server:
     'color': '#888888',
     'head': 'default',
     'tail': 'default',
+    'version': '1.0.0',
   }
 
   def __init__(self, data_path:str, snake_type:str, storage_type:str, debug:bool=False, check_tls_security:bool=False):
@@ -42,6 +43,7 @@ class Server:
       'max_turn': 0,
     }
     self.logger = build_logger('Battlesnake', debug_env_var='DEBUG_SERVER')
+    self.snake_version = self._get_snake_version()
 
     self.app = Quart('Battlesnake')
 
@@ -134,12 +136,36 @@ class Server:
     return await self._override_snake_config_with_environment_variables(snake_config)
 
   async def _override_snake_config_with_environment_variables(self, config:dict[str, str]) -> dict[str, str]:
+    config['version'] = self.snake_version
+
     for key in ('author', 'color', 'head', 'tail'):
       value = os.environ.get(f'SNAKE_{key.upper()}')
       if value is not None:
         config[key] = value
+
+    version_override = os.environ.get('SNAKE_VERSION')
+    if version_override is not None:
+      config['version'] = version_override
+
     return config
 
+  def _get_snake_version(self) -> str:
+    configured_version = SnakeBuilder.get_version(self.snake_type)
+    if configured_version:
+      return configured_version
+
+    try:
+      snake = SnakeBuilder.build(self.snake_type)
+    except Exception:
+      return self.default_snake_config['version']
+
+    version = getattr(snake, 'version', None)
+    if version is None:
+      version = getattr(snake, 'VERSION', None)
+    if not version:
+      return self.default_snake_config['version']
+    return str(version)
+
   async def _create_game_board(self, game_state:dict):
     game_id = game_state['game']['id']
     new_game_board = GameBoard(