Internetberechtigungen fehlten

android/app/src/main/AndroidManifest.xml

@@ -1,6 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+    <uses-permission android:name="android.permission.INTERNET" />
     <application
         android:label="egg_timer_advanced"
         android:name="${applicationName}"

release.sh

@@ -1,4 +1,6 @@
 #!/bin/bash
+flutter clean
+flutter pub get
 flutter build apk
 cp build/app/outputs/flutter-apk/app-release.apk ./release/eggtimer.apk
 echo "APK built and copied to ./release/eggtimer.apk"