bundles/icinga2: add notification support via ntfy

bundles/icinga2/files/check_sipgate_account_balance

@@ -1,16 +1,17 @@
 #!/usr/bin/env python3
 
+from json import load
 from sys import exit
 
 from requests import get
 
-SIPGATE_USER = '${node.metadata['icinga2']['sipgate_user']}'
-SIPGATE_PASS = '${node.metadata['icinga2']['sipgate_pass']}'
+with open('/etc/icinga2/notification_config.json') as f:
+    CONFIG = load(f)
 
 try:
     r = get(
         'https://api.sipgate.com/v2/balance',
-        auth=(SIPGATE_USER, SIPGATE_PASS),
+        auth=(CONFIG['sipgate']['user'], CONFIG['sipgate']['password']),
         headers={'Accept': 'application/json'},
     )