Update Dockerfile

Dockerfile

@@ -22,7 +22,7 @@ RUN echo '#!/bin/bash' > start.sh && \
     echo 'sleep 5' >> start.sh && \
     echo 'ollama pull granite4:latest' >> start.sh && \
     echo 'ollama pull llama3.2:latest' >> start.sh && \
-    echo 'ollama pull gemma2:latest' >> start.sh && \
+    echo 'ollama pull gemma3:latest' >> start.sh && \
     echo 'uvicorn api:app --host 0.0.0.0 --port 7860' >> start.sh && \
     chmod +x start.sh