Update build.gradle.kts

Author: RandomModderJDK

android/app/build.gradle.kts

@@ -5,6 +5,11 @@ plugins {
     id("dev.flutter.flutter-gradle-plugin")
 }
 
+def keystoreProperties = new Properties()
+def keystorePropertiesFile = rootProject.file("key.properties")
+if (keystorePropertiesFile.exists()) {
+    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
+}
 
 android {
     namespace = "de.randomfactory.randommodder.hw_manager_flutter"
@@ -30,11 +35,18 @@ android {
         versionName = flutter.versionName
     }
 
+    signingConfigs {
+        release {
+            keyAlias keystoreProperties["keyAlias"]
+            keyPassword keystoreProperties["keyPassword"]
+            storeFile keystoreProperties["storeFile"] ? file(keystoreProperties["storeFile"]) : null
+            storePassword keystoreProperties["storePassword"]
+        }
+    }
+
     buildTypes {
         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.getByName("debug")
+            signingConfig signingConfigs.release // <-- use release signing
 
             // Enables code-related app optimization.
             isMinifyEnabled = true