Add pipenv example

Dockerfile-pipenv

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+# This is the same idea as Dockerfile, but this one uses pipenv with the Pipfile
+# and Pipfile.lock instead of requirements.txt.
+#
+########
+# Python dependencies builder
+#
+FROM python:3-stretch AS builder
+
+# Always set a working directory
+WORKDIR /app
+# Sets utf-8 encoding for Python
+ENV LANG=C.UTF-8
+# Turns off writing .pyc files. Superfluous on an ephemeral container.
+ENV PYTHONDONTWRITEBYTECODE=1
+# Seems to speed things up
+ENV PYTHONUNBUFFERED=1
+
+# Ensures that the python and pip executables used
+# in the image will be those from our virtualenv.
+ENV PATH="/venv/bin:$PATH"
+
+# Install OS package dependencies.
+# Do all of this in one RUN to limit final image size.
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends gettext build-essential && \
+    rm -rf /var/lib/apt/lists/*
+
+# Setup the virtualenv
+RUN python -m venv /venv
+
+# Install Python deps
+RUN pip install pipenv
+COPY Pipfile Pipfile.lock ./
+RUN pipenv install --system --deploy
+
+
+########
+# slim app container
+#
+FROM python:3-slim-stretch AS app
+
+# Extra python env
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+ENV PIP_DISABLE_PIP_VERSION_CHECK=1
+ENV PATH="/venv/bin:$PATH"
+ENV PORT=8000
+
+# add non-priviledged user
+RUN adduser --uid 1000 --disabled-password --gecos '' --no-create-home webdev
+
+WORKDIR /app
+EXPOSE 8000
+CMD ["python", "app.py"]
+
+# copy in Python environment
+COPY --from=builder /venv /venv
+
+COPY ./static ./static
+COPY ./templates ./templates
+COPY ./app.py ./
+
+RUN chown webdev.webdev -R .
+USER webdev

Pipfile

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+[[source]]
+name = "pypi"
+url = "https://pypi.org/simple"
+verify_ssl = true
+
+[dev-packages]
+
+[packages]
+responder = "*"
+
+[requires]
+python_version = "3.7"