Debug mode exposed in Docker image

docker/README.md

@@ -12,6 +12,7 @@ Several options, such as the timezone and admin password are customizable using
 * ``DOCKER_SAL_TZ``: The desired [timezone](http://en.wikipedia.org/wiki/List_of_tz_database_time_zones). Defaults to ``Europe/London``.
 * ``DOCKER_SAL_ADMINS``: The admin user's details. Defaults to ``Docker User, docker@localhost``.
 * ``DOCKER_SAL_PLUGIN_ORDER``: The order plugins are displayed in. Defaults to ``Activity,Status,OperatingSystem,Uptime,Memory``.
+* ``DOCKER_SAL_DEBUG``: Whether debug mode is enabled or not. Valid values are ``true`` and ``false``. Defaults to ``false``.
 
 If you require more advanced settings, for example if you want to hide certain plugins from certain Business Units or if you have a plugin that needs settings, you can override ``settings.py`` with your own. A good starting place can be found on this image's [Github repository](https://github.com/grahamgilbert/macadmins-sal/blob/master/settings.py).
 

docker/settings_import.py

@@ -2,6 +2,12 @@
 from os import getenv
 import locale
 
+# Read the DEBUG setting from env var
+if getenv('DOCKER_SAL_DEBUG').lower == 'true':
+    DEBUG = True
+else:
+    DEBUG = False
+
 # Read list of admins from $DOCKER_SAL_ADMINS env var
 admin_list = []
 if getenv('DOCKER_SAL_ADMINS'):