feat(base-app): Add docker setup

Adding a dockerfile as well as an `entrypoint.sh` file for deployment
using `gunicorn`.

.docker/entrypoint.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+# Start Dash and run in background
+echo "Starting Dash app..."
+poetry run gunicorn app:server -b 0.0.0.0:8000

Dockerfile

@@ -0,0 +1,45 @@
+ARG PYTHON_VERSION_TAG=3.12
+ARG PYTHON_VARIANT_TAG=slim
+
+# Use official Python image as base
+# ${PYTHON_VARIANT_TAG:+-${PYTHON_VARIANT_TAG}} is a conditional expansion
+# that adds a dash before the variant tag if it is not empty
+FROM python:${PYTHON_VERSION_TAG}${PYTHON_VARIANT_TAG:+-${PYTHON_VARIANT_TAG}}
+
+# Set up poetry environment
+ARG POETRY_VERSION=1.8.3
+
+ENV POETRY_HOME=/opt/poetry
+ENV POETRY_VENV=/opt/poetry-venv
+ENV POETRY_CACHE_DIR=/opt/.cache
+
+# Install poetry separated from system interpreter
+RUN python3 -m venv $POETRY_VENV \
+	&& $POETRY_VENV/bin/pip install -U pip setuptools \
+	&& $POETRY_VENV/bin/pip install poetry==${POETRY_VERSION}
+
+# Add `poetry` to PATH
+ENV PATH="${POETRY_VENV}/bin:${PATH}"
+
+RUN poetry config virtualenvs.in-project true
+
+# Export in first position so that "python" calls are from .venv
+ENV PATH="/app/.venv/bin:${PATH}"
+ENV PYTHONPATH="/app/:${PYTHONPATH}"
+
+COPY pyproject.toml .
+COPY poetry.lock .
+COPY app/ app/
+
+RUN poetry install --no-interaction --no-dev
+
+COPY ./.docker/entrypoint.sh /app/entrypoint.sh
+RUN chmod +x /app/entrypoint.sh
+
+WORKDIR /app
+
+
+EXPOSE 80
+EXPOSE 8000
+
+ENTRYPOINT ["./entrypoint.sh"]