try release publish key

android/app/build.gradle

@@ -65,7 +65,7 @@ android {
         release {
             // TODO: Add your own signing config for the release build.
             // Signing with the debug keys for now, so `flutter run --release` works.
-            signingConfig signingConfigs.debug
+            signingConfig signingConfigs.release
             useProguard true
 
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'