Dockerfile

# --- Stage 1: The Builder ---
# We use a full python image to build our dependencies
FROM python:3.9 as builder

WORKDIR /usr/src/app

# Create a virtual environment
RUN python -m venv /opt/venv

# Make sure all commands use the venv
ENV PATH="/opt/venv/bin:"

# Copy and install the requirements
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# --- Stage 2: The Final Image ---
# We use a slim image for a smaller footprint
FROM python:3.9-slim

WORKDIR /usr/src/app

# Copy the virtual environment from the builder stage
COPY --from=builder /opt/venv /opt/venv

# Copy the application code
COPY . .

# Activate the virtual environment
ENV PATH="/opt/venv/bin:"

# Expose the port the app runs on
EXPOSE 8000

# Run the application
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]