Update dockerfile

Dockerfile

@@ -1,8 +1,9 @@
 FROM tiangolo/uvicorn-gunicorn-fastapi:python3.8-slim-2020-06-06
 RUN apt update && apt install -y libmagic1 python3-testresources patch && rm -rf /var/lib/apt/lists/*
-RUN python -m pip install --upgrade pip
-COPY requirements.txt requirements.txt
-RUN python -m pip install -r requirements.txt
+RUN python -m pip install --upgrade pip virtualenv poetry
+COPY poetry.lock poetry.lock
+COPY pyproject.toml pyproject.toml
+RUN poetry install
 COPY deploy /repo/deploy
 COPY tests /repo/tests
 COPY run-seed.sh /repo/run-seed.sh