Issue using environment variable credentials with `$` char

[giovannicimolin]

Because how database credentials are imported, if there's a $ character in the password, it'll be truncated and notifier will fail to start.

Steps to reproduce:

1. Edit the notifier_env file and change the password like this:

export NOTIFIER_DATABASE_PASSWORD="#$S6WRDWjJV"

2. Using the env, go into django shell with python manage.py shell:

>>> from django.conf import settings
>>> settings.DATABASES['default']['PASSWORD']
'#'