Add release signing and German reel handling

app/build.gradle.kts

@@ -1,8 +1,19 @@
+import java.util.Properties
+
 plugins {
     id("com.android.application")
     id("org.jetbrains.kotlin.plugin.compose")
 }
 
+val keystorePropertiesFile = rootProject.file("keystore.properties")
+val keystoreProperties = Properties().apply {
+    if (keystorePropertiesFile.exists()) {
+        keystorePropertiesFile.inputStream().use(::load)
+    }
+}
+val hasReleaseSigning = listOf("storeFile", "storePassword", "keyAlias", "keyPassword")
+    .all { keystoreProperties.getProperty(it).isNullOrBlank().not() }
+
 android {
     namespace = "com.example.instanoreels"
     compileSdk = 36
@@ -17,9 +28,23 @@ android {
         buildConfigField("String", "INSTAGRAM_PACKAGE", "\"com.instagram.android\"")
     }
 
+    signingConfigs {
+        if (hasReleaseSigning) {
+            create("release") {
+                storeFile = rootProject.file(keystoreProperties.getProperty("storeFile"))
+                storePassword = keystoreProperties.getProperty("storePassword")
+                keyAlias = keystoreProperties.getProperty("keyAlias")
+                keyPassword = keystoreProperties.getProperty("keyPassword")
+            }
+        }
+    }
+
     buildTypes {
         release {
             isMinifyEnabled = false
+            if (hasReleaseSigning) {
+                signingConfig = signingConfigs.getByName("release")
+            }
             proguardFiles(
                 getDefaultProguardFile("proguard-android-optimize.txt"),
                 "proguard-rules.pro"