Update dockerfile

Dockerfile

@@ -1,18 +1,14 @@
-# Use the official Python 3.8 slim image as the base image
-FROM python:3.11-slim
+FROM ghcr.io/praekeltfoundation/python-base-nw:3.11-bullseye as build
 
-# Set the working directory within the container
-WORKDIR /api-flask
+RUN pip install poetry==1.8.4
+COPY . ./
+RUN poetry config virtualenvs.in-project true \
+    && poetry install --no-dev --no-interaction --no-ansi
 
-# Copy the necessary files and directories into the container
-COPY src /api-flask/
-COPY src/data/ /api-flask/data/
+FROM ghcr.io/praekeltfoundation/python-base-nw:3.11-bullseye
+COPY --from=build .venv/ .venv/
+COPY src src/
 
-# Upgrade pip and install Python dependencies
-RUN pip3 install --upgrade pip && pip install --no-cache-dir -r requirements.txt
-
-# Expose port 5000 for the Flask application
 EXPOSE 5000
 
-# Define the command to run the Flask application using Gunicorn
 CMD ["gunicorn", "application:app", "-b", "0.0.0.0:5000", "-w", "4"]