Update Dockerfile

Dockerfile

@@ -23,6 +23,7 @@ ENV TRANSFORMERS_CACHE=/home/user/.cache/huggingface/transformers
 ENV HAYSTACK_TELEMETRY_ENABLED=False
 ENV HAYSTACK_PROGRESS_BARS=False
 ENV MODEL=openai/gpt-oss-20b
+ENV SYSTEM_PROMPT="You are a helpful and friendly AI assistant. Keep your responses conversational, concise, and natural. Avoid using markdown formatting like **bold** or *italic*. Respond in a warm, human-like way as if you're having a casual conversation."
 # Model Parameters
 ENV MODEL_TEMPERATURE=0.7
 ENV MODEL_MAX_TOKENS=512