move some settings to environment variables

docker-compose.yml

@@ -19,6 +19,8 @@ services:
     ports:
       - "8000:8000"
     environment:
+      - DEBUG=False
       - DJANGO_SETTINGS_MODULE=network_inventory.settings.docker
+      - SECRET_KEY=developemenet_key
     depends_on:
       - db

network_inventory/network_inventory/settings/docker.py

@@ -5,11 +5,10 @@ ALLOWED_HOSTS = [
     '127.0.0.1',
 ]
 
-# SECURITY WARNING: keep the secret key used in production secret!
-SECRET_KEY = 'development_key'
+DEBUG = os.environ.get('DEBUG')
 
-# SECURITY WARNING: don't run with debug turned on in production!
-DEBUG = True
+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY = os.environ.get('SECRET_KEY')
 
 DATABASES = {
     'default': {