Update app.py

app.py

@@ -56,7 +56,7 @@ MIN_TOPIC  = int(os.getenv("MIN_TOPIC_SIZE", "10"))
 MAX_DOCS   = int(os.getenv("MAX_DOCS", "5000"))
 
 # ── 5. Initialise models once at container start ─────────────────────────────
-embeddings  = SentenceTransformer(MODEL_NAME)
+embeddings = SentenceTransformer(MODEL_NAME, cache_folder="/tmp/hfcache")
 topic_model = BERTopic(
     embedding_model=embeddings,
     min_topic_size=MIN_TOPIC,