chore : changes for build signed app

android/app/build.gradle.kts

@@ -1,9 +1,21 @@
+import org.gradle.kotlin.dsl.release
+import java.io.FileInputStream
+import java.util.Properties
+
 plugins {
     id("com.android.application")
     id("kotlin-android")
     id("dev.flutter.flutter-gradle-plugin")
 }
 
+val keystoreProperties = Properties()
+val keystorePropertiesFile = rootProject.file("key.properties")
+if (keystorePropertiesFile.exists()) {
+    keystoreProperties.load(FileInputStream(keystorePropertiesFile))
+}else{
+    println("key.properties not found")
+}
+
 android {
     namespace = "ir.mnpc.rasadyar"
     compileSdk = flutter.compileSdkVersion
@@ -31,9 +43,22 @@ android {
             excludes += "META-INF/DEPENDENCIES"
         }
     }
+    signingConfigs {
+        create("release") {
+            keyAlias = keystoreProperties["keyAlias"] as String?
+            keyPassword = keystoreProperties["keyPassword"] as String?
+            storeFile = keystoreProperties["storeFile"]?.let { file(it as String) }
+            storePassword = keystoreProperties["storePassword"] as String?
+        }
+    }
 
     buildTypes {
         release {
+            signingConfig = signingConfigs.getByName("release")
+            isMinifyEnabled = true
+            isShrinkResources = true
+        }
+        debug {
             signingConfig = signingConfigs.getByName("debug")
         }
     }