Gradle: Add release APK signature

android/app/build.gradle

@@ -1,3 +1,16 @@
+def getPassword(String currentUser, String keyChain) {
+    def stdout = new ByteArrayOutputStream()
+    def stderr = new ByteArrayOutputStream()
+    exec {
+        commandLine 'security', '-q', 'find-generic-password', '-a', currentUser, '-s', keyChain, '-w'
+        standardOutput = stdout
+        errorOutput = stderr
+        ignoreExitValue true
+    }
+    //noinspection GroovyAssignabilityCheck
+    stdout.toString().trim()
+}
+
 buildscript {
     repositories {
         maven { url 'https://plugins.gradle.org/m2/' } // Gradle Plugin Portal
@@ -129,6 +142,7 @@ def jscFlavor = 'org.webkit:android-jsc:+'
  * and the benefits of using Hermes will therefore be sharply reduced.
  */
 def enableHermes = project.ext.react.get("enableHermes", false);
+def pass = getPassword("danang","android_keystore")
 
 android {
     compileSdkVersion rootProject.ext.compileSdkVersion
@@ -160,6 +174,14 @@ android {
             keyAlias 'androiddebugkey'
             keyPassword 'android'
         }
+        release {
+            if (project.hasProperty('MYAPP_UPLOAD_STORE_FILE')) {
+                storeFile file(MYAPP_UPLOAD_STORE_FILE)
+                storePassword pass // Change this
+                keyAlias MYAPP_UPLOAD_KEY_ALIAS
+                keyPassword pass // Change this
+            }
+        }
     }
     buildTypes {
         debug {
@@ -168,7 +190,7 @@ android {
         release {
             // Caution! In production, you need to generate your own keystore file.
             // see https://facebook.github.io/react-native/docs/signed-apk-android.
-            signingConfig signingConfigs.debug
+            signingConfig signingConfigs.release
             minifyEnabled enableProguardInReleaseBuilds
             proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
         }