feat(emoji.py): add support for Docker-specific emoji assets path

Introduce a new constant, DOCKER_EMOJI_ASSETS_PATH, to specify the
location of emoji assets when running in a Docker environment. The
EmojiManager now checks if the application is running in Docker and
automatically uses this path if no custom path is provided. This change
ensures that the application can correctly locate emoji assets when
deployed in a Docker container, improving deployment flexibility and
ease of configuration.

Author: kzndotsh

tux/utils/emoji.py

@@ -9,6 +9,7 @@
 # --- Configuration Constants ---
 
 DEFAULT_EMOJI_ASSETS_PATH = Path(__file__).parents[2] / "assets" / "emojis"
+DOCKER_EMOJI_ASSETS_PATH = Path("/app/assets/emojis")
 DEFAULT_EMOJI_CREATE_DELAY = 1.0
 VALID_EMOJI_EXTENSIONS = [".png", ".gif", ".jpg", ".jpeg", ".webp"]
 MIN_EMOJI_NAME_LENGTH = 2
@@ -91,6 +92,11 @@ def __init__(
         self._init_lock = asyncio.Lock()
         self._initialized = False
 
+        # If in Docker and no custom path was provided, use the Docker path
+        if not emojis_path and DOCKER_EMOJI_ASSETS_PATH.exists() and DOCKER_EMOJI_ASSETS_PATH.is_dir():
+            logger.info(f"Docker environment detected, using emoji path: {DOCKER_EMOJI_ASSETS_PATH}")
+            self.emojis_path = DOCKER_EMOJI_ASSETS_PATH
+
         # Ensure the emoji path exists and is a directory
         if not self.emojis_path.is_dir():
             logger.critical(