Create temporary migrations when deploying dev from CircleCi

config.yml

# Dev only: 
# Create migrations for any model changes that don't have migrations committed yet.
# Makes the migrations locally and push them up since we can't write files outside /tmp in Lambda
if [[ "${CIRCLE_BRANCH}" == "dev" ]]
then
  python manage.py makemigrations --name ${CIRCLE_BRANCH}_`date "+%Y%m%d-%H%M%S"` --settings=app.settings.production
fi
zappa update -s config/zappa_settings.json ${CIRCLE_BRANCH}