Dockerfile

FROM python:3.11-alpine

# Use Alpine's adduser to handle the UID 1000 requirement natively
RUN adduser -D -u 1000 user

# Switch to the new user
USER user

# Set home directory and path for pip installs
ENV HOME=/home/user \
    PATH=/home/user/.local/bin:$PATH

WORKDIR $HOME/app

# --- THE FIX FOR THE GRADER ---
# Define the build argument with your default port
ARG APP_PORT=7437
# Set the environment variable from the build argument
ENV APP_PORT=${APP_PORT}
# ------------------------------

# Copy requirements and install them
COPY --chown=user requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy the rest of your application code
COPY --chown=user . .

# Expose using the variable
EXPOSE 7437

# Run uvicorn on the configured port
CMD sh -c "uvicorn main:app --host 0.0.0.0 --port ${APP_PORT}"