Added update detection

src/app/app.component.ts

@@ -1,5 +1,6 @@
 import { Component } from '@angular/core';
-import { IonApp, IonRouterOutlet } from '@ionic/angular/standalone';
+import {AlertController, IonApp, IonRouterOutlet} from '@ionic/angular/standalone';
+import {SwUpdate} from "@angular/service-worker";
 
 @Component({
   selector: 'app-root',
@@ -9,5 +10,36 @@ import { IonApp, IonRouterOutlet } from '@ionic/angular/standalone';
 })
 export class AppComponent {
   public static currentDate: any;
-  constructor() {}
+  constructor(private updates: SwUpdate, private alerts: AlertController) {
+    if (updates.isEnabled) {
+      updates.checkForUpdate().then(async available => {
+        if (available) await this.showUpdateAlert();
+      });
+    }
+  }
+
+  private async showUpdateAlert() {
+    const alert = await this.alerts.create({
+      header: "Update verfügbar!",
+      message: 'Möchtest du das Update herunterladen?',
+      buttons: [
+        {
+          text: "Nein",
+          role: "cancel"
+        },
+        {
+          text: "Ja",
+          role: "destructive"
+        }
+      ]
+    });
+
+    await alert.present();
+    const result = await alert.onDidDismiss();
+
+    if (result.role == "destructive") {
+      await this.updates.activateUpdate();
+      document.location.reload();
+    }
+  }
 }