Add Docker setup

Add a Dockerfile and an entrypoint shell script.

Dockerfile

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+ARG DEBIAN_RELEASE=buster
+FROM debian:$DEBIAN_RELEASE
+LABEL maintainer="Jan Dittberner <jan@dittberner.info>"
+
+ENV LC_ALL=C.UTF-8
+ENV LANG=C.UTF-8
+
+RUN apt-get update \
+    && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+    build-essential \
+    dumb-init \
+    gettext \
+    git \
+    python3-dev \
+    python3-pip \
+    python3-setuptools \
+    python3-virtualenv \
+    python3-wheel \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*.*
+
+RUN python3 -m pip install --prefix=/usr/local pipenv
+
+ARG GVAGID=2000
+ARG GVAUID=2000
+
+ARG GVAAPP=gvaweb
+
+WORKDIR /srv/$GVAAPP
+
+COPY Pipfile Pipfile.lock /srv/$GVAAPP/
+
+RUN addgroup --gid $GVAGID $GVAAPP ; \
+    adduser --home /home/$GVAAPP --shell /bin/bash --uid $GVAUID --gid $GVAGID --disabled-password --gecos "User for gnuviechadmin component $GVAAPP" $GVAAPP
+
+USER $GVAAPP
+RUN python3 -m virtualenv --python=python3 /home/$GVAAPP/$GVAAPP-venv ; \
+    /home/$GVAAPP/$GVAAPP-venv/bin/python3 -m pip install -U pip ; \
+    VIRTUAL_ENV=/home/$GVAAPP/$GVAAPP-venv pipenv install --deploy --ignore-pipfile --dev
+
+VOLUME /srv/$GVAAPP
+
+COPY gvaweb.sh /srv/
+
+ENTRYPOINT ["dumb-init", "/srv/gvaweb.sh"]

gvaweb.sh

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+#!/bin/sh
+
+set -e
+
+. /home/gvaweb/gvaweb-venv/bin/activate
+cd /srv/gvaweb/gvaweb
+celery -A gvaweb worker -Q web -l info