Update Dockerfile

Dockerfile

@@ -17,6 +17,10 @@ RUN pip install --no-cache-dir -r requirements.txt
 # Pre-download SentenceTransformer model during build
 RUN python -c "from sentence_transformers import SentenceTransformer; SentenceTransformer('all-MiniLM-L6-v2', cache_folder='/app/models_cache')"
 
+# Force cache invalidation - change this value to rebuild
+ARG CACHEBUST=2025-12-03-13:30:00
+RUN echo "Cache bust: $CACHEBUST"
+
 # Copy application code
 COPY . .