Update Dockerfile

EXPOSE 5000

# First, copy and install only the requirements...

ENV PIPENV_VENV_IN_PROJECT=1 

RUN pip install --upgrade pip setuptools

COPY requirements.txt .

RUN pip install pipenv

COPY Pipfile.lock .

RUN pipenv requirements > requirements.txt

RUN pip uninstall --yes pipenv

RUN pip install -r requirements.txt

# ... then the rest of the application. This allows the installation stage to be cached most of the time

# (so we don't have reinstall of all dependencies every time the container is rebuilt)

COPY . .