Dockerfile

# syntax=docker/dockerfile:1.7

# ---------- Builder ----------
FROM python:3.12-slim AS builder

ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1 \
    PIP_DISABLE_PIP_VERSION_CHECK=1

WORKDIR /app

# Install build deps (if any package needs compilation)
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# Install Python dependencies first (better layer caching)
COPY requirements.txt .
RUN pip install --prefix=/install -r requirements.txt

# ---------- Runtime ----------
FROM python:3.12-slim AS runtime

ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PATH="/usr/local/bin:$PATH"

# Non-root user for security
RUN groupadd --gid 1000 app \
    && useradd --uid 1000 --gid app --shell /bin/bash --create-home app

WORKDIR /app

# Copy installed dependencies from builder
COPY --from=builder /install /usr/local

# Copy application code
COPY --chown=app:app . /app

USER app

EXPOSE 8000

HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
    CMD python -c "import urllib.request,sys; urllib.request.urlopen('http://127.0.0.1:8000/health', timeout=3); sys.exit(0)" || exit 1

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