Set PYTHONUNBUFFERED so scheduler output reaches docker logs

@@ -1,6 +1,7 @@FROM alpine:3.21ENV LANG "C.UTF-8"ENV LANG="C.UTF-8" \    PYTHONUNBUFFERED=1COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /usr/local/bin/COPY --from=oven/bun:alpine /usr/local/bin/bun /usr/local/bin/bun