Update Dockerfile

Dockerfile

@@ -23,6 +23,13 @@ COPY --chown=user requirements.txt .
 RUN pip install --no-cache-dir --upgrade pip && \
     pip install --no-cache-dir -r requirements.txt
 
+# Pre-download the SentenceTransformer embedding model to avoid runtime cold-starts
+RUN python - <<'PY'
+from sentence_transformers import SentenceTransformer
+
+SentenceTransformer("google/embeddinggemma-300m")
+PY
+
 # Copy the rest of the application code
 COPY --chown=user . .
 
@@ -32,4 +39,4 @@ EXPOSE 7860
 # Run the FastAPI app from the backend directory so local imports resolve
 WORKDIR $HOME/app/app/backend
 
-CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]