Dockerfile

# ---------- Stage 1: Build dependencies ----------
FROM python:3.11-slim AS builder

WORKDIR /app

RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    libopenblas-dev \
    liblapack-dev \
    gfortran \
    && rm -rf /var/lib/apt/lists/*

COPY req.txt .

RUN pip install --upgrade pip \
    && pip install --no-cache-dir -r req.txt \
    && pip install --no-cache-dir uvicorn

# ---------- Stage 2: Final lightweight image ----------
FROM python:3.11-slim

WORKDIR /app

# Copy only installed packages (fast!)
COPY --from=builder /usr/local /usr/local

# Copy app code
COPY . .

EXPOSE 8000

CMD ["uvicorn", "apps:app", "--host", "0.0.0.0", "--port", "8000"]