Use .env file for environment variables.

[adriaanwm]

Currently we have production.py and local.py files. For a config var, say FACEBOOK_API_SECRET we then have

FACEBOOK_API_SECRET = os.environ.get('FACEBOOK_API_SECRET')

for production.py, and

FACEBOOK_API_SECRET = 'some development secret'

for local.py.

Instead we could put all os.environ.get config in the common.py . Any environment variables can be set on local in a .env file like

export SENDGRID_SECRET='another secret'
export FACEBOOK_API_SECRET='some development secret'

and in make run we can add a call source .env to load the environment variables.

The benefit would be that the config will be less error prone (from adding a config variable in local and not updating it in production, or changing the name of one and not the other).