feat(release): release 서명 설정을 추가한다

app/build.gradle

@@ -1,4 +1,6 @@
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+import java.util.Locale
+import java.util.Properties
 
 plugins {
     id 'com.android.application'
@@ -13,6 +15,27 @@ plugins {
     id 'com.google.firebase.crashlytics'
 }
 
+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withInputStream { stream ->
+        localProperties.load(stream)
+    }
+}
+
+def releaseSigningPropertyKeys = [
+    'RELEASE_STORE_FILE',
+    'RELEASE_STORE_PASSWORD',
+    'RELEASE_KEY_ALIAS',
+    'RELEASE_KEY_PASSWORD'
+]
+def releaseSigningProperty = { key ->
+    localProperties.getProperty(key)?.trim()
+}
+def missingReleaseSigningProperties = {
+    releaseSigningPropertyKeys.findAll { key -> !releaseSigningProperty(key) }
+}
+
 android {
     namespace 'kr.co.vividnext.sodalive'
     compileSdk = 35
@@ -68,8 +91,25 @@ android {
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 
+    signingConfigs {
+        release {
+            def releaseStoreFile = releaseSigningProperty('RELEASE_STORE_FILE')
+            def releaseStorePassword = releaseSigningProperty('RELEASE_STORE_PASSWORD')
+            def releaseKeyAlias = releaseSigningProperty('RELEASE_KEY_ALIAS')
+            def releaseKeyPassword = releaseSigningProperty('RELEASE_KEY_PASSWORD')
+
+            if (missingReleaseSigningProperties().isEmpty()) {
+                storeFile rootProject.file(releaseStoreFile)
+                storePassword releaseStorePassword
+                keyAlias releaseKeyAlias
+                keyPassword releaseKeyPassword
+            }
+        }
+    }
+
     buildTypes {
         release {
+            signingConfig signingConfigs.release
             minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
 
@@ -172,6 +212,36 @@ android {
     }
 }
 
+gradle.taskGraph.whenReady { taskGraph ->
+    def requiresReleaseSigning = taskGraph.allTasks.any { task ->
+        def taskName = task.name.toLowerCase(Locale.US)
+        taskName.contains('release') && (
+            taskName.startsWith('assemble') ||
+                taskName.startsWith('bundle') ||
+                taskName.startsWith('install') ||
+                taskName.startsWith('package')
+        )
+    }
+
+    if (!requiresReleaseSigning) {
+        return
+    }
+
+    def missingProperties = missingReleaseSigningProperties()
+    if (!missingProperties.isEmpty()) {
+        throw new GradleException(
+            "Release signing properties are missing in local.properties: ${missingProperties.join(', ')}"
+        )
+    }
+
+    def releaseStoreFile = rootProject.file(releaseSigningProperty('RELEASE_STORE_FILE'))
+    if (!releaseStoreFile.exists()) {
+        throw new GradleException(
+            "Release signing store file does not exist: ${releaseStoreFile}"
+        )
+    }
+}
+
 dependencies {
     implementation "androidx.media:media:1.7.1"
     implementation 'androidx.core:core-ktx:1.16.0'