fix: set PYTHONUNBUFFERED=1 for Docker log output

Author: jackharrhy

Dockerfile

@@ -2,6 +2,8 @@ FROM python:3.13-slim
 
 COPY --from=ghcr.io/astral-sh/uv:latest /uv /bin/uv
 
+ENV PYTHONUNBUFFERED=1
+
 WORKDIR /app
 
 COPY pyproject.toml uv.lock README.md ./