android: add release signing support

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

android/build.gradle.kts

@@ -1,3 +1,5 @@
+import java.util.Properties
+
 plugins {
   id("org.jetbrains.compose") version "0.4.0"
   id("com.android.application")
@@ -27,6 +29,21 @@ android {
     versionCode = 1
     versionName = "1.0"
   }
+  val keystoreConfigFile = rootProject.layout.projectDirectory.file("keystore.properties")
+  if (keystoreConfigFile.asFile.exists()) {
+    val contents = providers.fileContents(keystoreConfigFile).asText.forUseAtConfigurationTime()
+    val keystoreProperties = Properties()
+    keystoreProperties.load(contents.get().byteInputStream())
+    signingConfigs {
+      register("release") {
+        keyAlias = keystoreProperties["keyAlias"] as String
+        keyPassword = keystoreProperties["keyPassword"] as String
+        storeFile = rootProject.file(keystoreProperties["storeFile"] as String)
+        storePassword = keystoreProperties["storePassword"] as String
+      }
+    }
+    buildTypes.all { signingConfig = signingConfigs.getByName("release") }
+  }
   buildTypes { getByName("release") { isMinifyEnabled = false } }
   compileOptions {
     sourceCompatibility = JavaVersion.VERSION_1_8