Dockerfile_multi_layer

# -----------------------------------------------------------------
# Stage 1: Build Dependencies
# -----------------------------------------------------------------
FROM ghcr.io/astral-sh/uv:latest AS uv-builder

# Set working directory for the build process
WORKDIR /app

# Enable bytecode compilation and unbuffered output for Python
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

# Install project dependencies first (this layer caches aggressively)
COPY pyproject.toml uv.lock ./
RUN --mount=type=cache,target=/root/.cache/uv \
    uv sync --no-dev --no-install-project --locked

# Copy the rest of the source code and install the project itself
COPY . /app
RUN --mount=type=cache,target=/root/.cache/uv \
    uv sync --no-dev --locked

# -----------------------------------------------------------------
# Stage 2: Final Runtime Image
# -----------------------------------------------------------------
FROM python:3.12-slim-bookworm

# Create a non-root user for security
RUN useradd -m --uid 1000 appuser
USER appuser

WORKDIR /app

# Copy the virtual environment and installed applications from the builder stage
COPY --from=uv-builder --chown=appuser:appuser /app/.venv /app/.venv

# Ensure the virtual environment's executables are on the PATH
ENV PATH="/app/.venv/bin:$PATH"

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

# Command to run your application
CMD ["uv", "run", "your_entrypoint_here"]