Add Ansible playbook for Toolforge deployment
This Ansible playbooks takes care of:
- Ensuring various directories exist, which follow the default layout [1]
- Checking out the latest code from Git repository
- Setting up crontabs (in the right places)
It unfortunately does not install/update the Python requirements,
as this needs to be done in a Kubernetes shell, which apparently
only works in interactive mode.
[1] https://wikitech.wikimedia.org/wiki/Help:Toolforge/Web#Python_(uWSGI)