build: add release signing config for Play Store AAB

Author: OpusDevs

android/.gitignore

@@ -26,6 +26,11 @@ build/
 # Local configuration file (sdk path, etc)
 local.properties
 
+# Signing secrets — never commit these
+keystore.properties
+*.jks
+*.keystore
+
 # Proguard folder generated by Eclipse
 proguard/
 

android/app/build.gradle

@@ -1,5 +1,11 @@
 apply plugin: 'com.android.application'
 
+def keystorePropertiesFile = rootProject.file("keystore.properties")
+def keystoreProperties = new Properties()
+if (keystorePropertiesFile.exists()) {
+    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
+}
+
 android {
     namespace = "com.opengis.app"
     compileSdk = rootProject.ext.compileSdkVersion
@@ -16,10 +22,19 @@ android {
             ignoreAssetsPattern = '!.svn:!.git:!.ds_store:!*.scc:.*:!CVS:!thumbs.db:!picasa.ini:!*~'
         }
     }
+    signingConfigs {
+        release {
+            keyAlias keystoreProperties['keyAlias']
+            keyPassword keystoreProperties['keyPassword']
+            storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
+            storePassword keystoreProperties['storePassword']
+        }
+    }
     buildTypes {
         release {
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            signingConfig signingConfigs.release
         }
     }
 }