Add signing configuration

app/build.gradle

@@ -7,6 +7,10 @@ plugins {
     id 'org.jetbrains.kotlin.plugin.serialization'
 }
 
+def keystorePropertiesFile = rootProject.file("keystore.properties")
+def keystoreProperties = new Properties()
+keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
+
 android {
     compileSdk 31
 
@@ -18,6 +22,15 @@ android {
         versionName "1.0"
     }
 
+    signingConfigs {
+        release {
+            keyAlias keystoreProperties['keyAlias']
+            keyPassword keystoreProperties['keyPassword']
+            storeFile file(keystoreProperties['storeFile'])
+            storePassword keystoreProperties['storePassword']
+        }
+    }
+
     buildTypes {
         debug {
             minifyEnabled true
@@ -28,6 +41,7 @@ android {
             minifyEnabled true
             shrinkResources true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+            signingConfig signingConfigs.release
         }
     }
     compileOptions {