setup docker image

Dockerfile

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+FROM python:3-slim
+
+# set work directory
+WORKDIR /usr/src/app
+
+# set environment variables
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+
+# install dependencies
+RUN pip install --upgrade pip
+COPY ./requirements.txt .
+RUN pip install -r requirements.txt