prepared to run as container

Dockerfile

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+###########
+# BUILDER #
+###########
+
+# pull official base image
+FROM python:3.8-slim-buster as builder
+
+# update system
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends build-essential && \
+    apt-get clean
+
+# set working 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 wheel --no-cache-dir --no-deps --wheel-dir /usr/src/app/wheels -r requirements.txt
+
+#########
+# FINAL #
+#########
+
+# pull official base image
+FROM python:3.8-slim-buster
+
+# create home directory and app user
+RUN mkdir -p /home/app && \
+    addgroup --system app && \
+    adduser --system --group app
+
+# create appropriate directories
+ENV APP_HOME=/home/app
+ENV APP_DATA=/home/app/data
+RUN mkdir -p ${APP_DATA}
+WORKDIR ${APP_HOME}
+
+# copy and install packages from builder
+COPY --from=builder /usr/src/app/wheels /wheels
+COPY --from=builder /usr/src/app/requirements.txt requirements.txt
+RUN pip install --no-cache /wheels/*
+
+# add app
+COPY ./code .
+
+# change ownership to app user
+RUN chown -R app:app ${APP_HOME}
+
+# change to the app user
+USER app
+
+ENTRYPOINT ["python", "main.py"]