build(settings/config.env): choisi s'il faut charger debugtoolbar

la django-debugtoolbar ajoute un overhead important
et n'est pas toujours a propos dans les tests locaux

config.env.example

@@ -78,3 +78,8 @@
 #
 # Note that it's always disabled in production.
 #DJANGO_DEBUG=off
+
+# Turn on/off django debug toolbar.
+#
+# Note that it has no effect in production.
+#DEBUG_TOOLBAR=off

gaby/settings/development.py

@@ -30,22 +30,25 @@ vars().update(env.email_url('DJANGO_EMAIL_URL', default='consolemail://'))
 # DJANGO DEBUG TOOLBAR
 # ------------------------------------------------------------------------------
 # https://django-debug-toolbar.readthedocs.io/en/stable/installation.html
-MIDDLEWARE += ['debug_toolbar.middleware.DebugToolbarMiddleware']  # noqa: F405
-INSTALLED_APPS += ['debug_toolbar', 'django_extensions']  # noqa: F405
+if env.bool('DEBUG_TOOLBAR', default=False):
+    MIDDLEWARE += [  # noqa: F405c
+        'debug_toolbar.middleware.DebugToolbarMiddleware'
+    ]
+    INSTALLED_APPS += ['debug_toolbar']  # noqa: F405
 
-INTERNAL_IPS = ['127.0.0.1']
+    INTERNAL_IPS = ['127.0.0.1']
 
-DEBUG_TOOLBAR_CONFIG = {
-    'DISABLE_PANELS': ['debug_toolbar.panels.redirects.RedirectsPanel'],
-    'SHOW_TEMPLATE_CONTEXT': True,
-    # Uncomment if jQuery is already loaded by your assets:
-    # 'JQUERY_URL': '',
-}
+    DEBUG_TOOLBAR_CONFIG = {
+        'DISABLE_PANELS': ['debug_toolbar.panels.redirects.RedirectsPanel'],
+        'SHOW_TEMPLATE_CONTEXT': True,
+        # Uncomment if jQuery is already loaded by your assets:
+        # 'JQUERY_URL': '',
+    }
 
 # DJANGO EXTENSIONS
 # ------------------------------------------------------------------------------
 # https://django-extensions.readthedocs.io/en/stable/index.html
-# INSTALLED_APPS += ['django_extensions']  # noqa: F405
+INSTALLED_APPS += ['django_extensions']  # noqa: F405
 
 LOGGING = {
     'version': 1,