Docker image for testing and depoying Django web app.

This image contains these softwares:

• su-exec, simple replacement for sudo
• Python 3
• PostgreSQL
• Redis
• Ansible (for deploying)
• SSH client
• Rsync
• Pytest, pytest-django, pytest-flakes
• Some header (dev) packages for building Python modules

This image doesn't contain Django. Django and other Python modules should be installed separately in container.