use poetry

Dockerfile

@@ -1,11 +1,17 @@
 FROM python:3.8-buster
 
-COPY . /app
+ENV PYTHONUNBUFFERED=1 \
+    POETRY_VERSION=1.1.2 \
+    POETRY_VIRTUALENVS_CREATE="false"
+
+RUN pip install "poetry==$POETRY_VERSION"
 
 WORKDIR /app
 
-RUN pip install --upgrade pip && \
-    pip install -r requirements.txt
+COPY pyproject.toml poetry.lock docker-entrypoint.sh ./
+RUN poetry install --no-interaction --no-ansi --no-dev
+
+COPY . /app
 
 EXPOSE 80