New notification provider: CallMeBot API (#4605)

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

server/notification-providers/call-me-bot.js

@@ -0,0 +1,23 @@
+const NotificationProvider = require("./notification-provider");
+const axios = require("axios");
+
+class CallMeBot extends NotificationProvider {
+    name = "CallMeBot";
+
+    /**
+     * @inheritdoc
+     */
+    async send(notification, msg, monitorJSON = null, heartbeatJSON = null) {
+        const okMsg = "Sent Successfully.";
+        try {
+            const url = new URL(notification.callMeBotEndpoint);
+            url.searchParams.set("text", msg);
+            await axios.get(url.toString());
+            return okMsg;
+        } catch (error) {
+            this.throwGeneralAxiosError(error);
+        }
+    }
+}
+
+module.exports = CallMeBot;