Add initial Docker set up

Dockerfile

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+FROM python:3.9-slim as build
+WORKDIR /app
+COPY . .
+
+RUN pip install --no-cache-dir --upgrade pip pipenv
+
+RUN apt-get update && apt-get upgrade -y && apt-get install -y git
+
+COPY Pipfile* /
+RUN pipenv install
+
+ADD startup.sh /
+RUN chmod +x /startup.sh
+
+CMD ["/startup.sh"]

startup.sh

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+#!/bin/bash
+
+pipenv run deposit
+pipenv run listen
+