feature: Add an option to enable Telegram to work behind a proxy. (#6125)

Co-authored-by: Frank Elsinga <frank@elsinga.de>

server/notification-providers/goalert.js

@@ -24,6 +24,7 @@ class GoAlert extends NotificationProvider {
             let config = {
                 headers: headers
             };
+            config = this.getAxiosConfigWithProxy(config);
             await axios.post(`${notification.goAlertBaseURL}/api/v2/generic/incoming?token=${notification.goAlertToken}`, data, config);
             return okMsg;
         } catch (error) {