Add basic Docker support

Dockerfile should not change in the future.
Docker-compose configuration need some work on LDAP init before fully
working.

Dockerfile

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+FROM python:3.6-alpine
+
+# Django code will be in /usr/src/app/
+# During development you should mount the git code there,
+# During production you should copy the code in the image.
+WORKDIR /usr/src/app
+
+# Set environment variables
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+
+# Install dependencies via pipenv
+ADD Pipfile* ./
+RUN apk update && apk add gcc musl-dev postgresql-dev
+RUN pip install --upgrade pip==18.0
+RUN pip install pipenv==2018.7.1
+RUN pipenv install --deploy --system --dev
+
+# Pass only port 8080
+EXPOSE 8080
+
+# Set entrypoint : make migrations and collect statics
+COPY entrypoint.sh ./
+ENTRYPOINT [ "./entrypoint.sh" ]
+
+# Start Django app
+CMD ["python", "manage.py", "runserver", "0.0.0.0:8080"]
+

docker-compose.yml

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+# Use for development purposes only
+
+version: '3'
+
+services:
+  db:
+    image: postgres:alpine
+    environment:
+      - POSTGRES_DB=re2o
+      - POSTGRES_USER=re2o
+      - POSTGRES_PASSWORD=changeme
+      - POSTGRES_INITDB_ARGS=--encoding=UTF-8 --lc-collate=fr_FR.UTF-8 --lc-ctype=fr_FR.UTF-8
+    volumes:
+      - db_data:/var/lib/postgresql/data
+    restart: always
+  web:
+    build: .
+    ports:
+      - "8000:8000"
+    depends_on:
+      - db
+    volumes:
+      - .:/usr/src/app
+    restart: always
+
+volumes:
+  db_data:
+

entrypoint.sh

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+#!/bin/sh
+
+# Migrate database
+python manage.py migrate --noinput
+
+# Collect statics
+python manage.py collectstatic --noinput
+
+exec "$@"
+