feat(android): 릴리즈 서명 설정 추가

- keystore 파일 추가 (doc/key/askiineverdie.jks)
- key.properties 설정 파일 추가
- build.gradle.kts에 릴리즈 서명 설정 추가

android/app/build.gradle.kts

@@ -1,3 +1,6 @@
+import java.util.Properties
+import java.io.FileInputStream
+
 plugins {
     id("com.android.application")
     id("kotlin-android")
@@ -5,6 +8,13 @@ plugins {
     id("dev.flutter.flutter-gradle-plugin")
 }
 
+// key.properties 파일 로드
+val keystorePropertiesFile = rootProject.file("key.properties")
+val keystoreProperties = Properties()
+if (keystorePropertiesFile.exists()) {
+    keystoreProperties.load(FileInputStream(keystorePropertiesFile))
+}
+
 android {
     namespace = "com.naturebridgeai.asciineverdie"
     compileSdk = flutter.compileSdkVersion
@@ -20,21 +30,25 @@ android {
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId = "com.naturebridgeai.asciineverdie"
-        // You can update the following values to match your application needs.
-        // For more information, see: https://flutter.dev/to/review-gradle-config.
         minSdk = flutter.minSdkVersion
         targetSdk = flutter.targetSdkVersion
         versionCode = flutter.versionCode
         versionName = flutter.versionName
     }
 
+    signingConfigs {
+        create("release") {
+            keyAlias = keystoreProperties["keyAlias"] as String?
+            keyPassword = keystoreProperties["keyPassword"] as String?
+            storeFile = keystoreProperties["storeFile"]?.let { file(it) }
+            storePassword = keystoreProperties["storePassword"] as String?
+        }
+    }
+
     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.getByName("release")
         }
     }
 }

android/key.properties

@@ -0,0 +1,4 @@
+storePassword=askiineverdie
+keyPassword=askiineverdie
+keyAlias=askiineverdie
+storeFile=../../doc/key/askiineverdie.jks

doc/key/Readme.md

@@ -0,0 +1,3 @@
+storePassword=askiineverdie
+keyPassword=askiineverdie
+keyAlias=askiineverdie