minor improvements

bot/cronjob/chat_photo.py

@@ -0,0 +1,22 @@
+import os
+from pathlib import Path
+from telegram.ext import ExtBot
+import random
+
+MEDIA_DIR = Path(os.getenv("MEDIA_DIR"))
+CHAT_ID = os.getenv("CHAT_ID")
+
+
+async def set_random(bot: ExtBot) -> None:
+    """Set a random chat photo."""
+    if os.getenv("DOCKERIZED", "false") == "false":
+        # only change image on prod
+        return
+    
+    photos = list(MEDIA_DIR.glob("*.jpg")) + list(MEDIA_DIR.glob("*.png")) + list(MEDIA_DIR.glob("*.jpeg"))
+    
+    if len(photos) == 0:
+        return
+
+    photo = random.choice(photos)
+    await bot.set_chat_photo(CHAT_ID, photo)