Using the previous Ansible instructions does not work. So for now:

Pull the code to the directory

Set shared/db.php to:
  group 'www-data'
  mode '0640'

Create empty devlog.txt if it doesn't exist
  path: "upload/devlog.txt"
  group: www-data
  mode: "0644"

Install PHPMailer
  path: "upload"
  run: "composer install"