setting: extract authentic2 URL from environment

portail_citoyen2/settings.py

@@ -144,7 +144,7 @@ LOGIN_URL = os.environ.get('LOGIN_URL', '/accounts/authentic2/login/?process=log
 SOCIALACCOUNT_QUERY_EMAIL = True
 SOCIALACCOUNT_PROVIDERS = {
         'authentic2': { 
-            'URL': 'http://localhost:9000/idp/oauth2/',
+            'URL': os.environ.get('AUTHENTIC2_URL', '') + '/idp/oauth2/',
             'SCOPE': ['read', 'write'],
             },
 }