feat: Update Android namespace and application ID, and configure release signing.

android/app/build.gradle.kts

@@ -9,7 +9,7 @@ plugins {
 }
 
 android {
-    namespace = "com.example.travel_mate"
+    namespace = "be.davdayronvl.travel_mate"
     compileSdk = flutter.compileSdkVersion
     ndkVersion = flutter.ndkVersion
 
@@ -24,7 +24,7 @@ android {
 
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId = "com.example.travel_mate"
+        applicationId = "be.davdayronvl.travel_mate"
         // You can update the following values to match your application needs.
         // For more information, see: https://flutter.dev/to/review-gradle-config.
         minSdk = flutter.minSdkVersion
@@ -32,12 +32,18 @@ android {
         versionCode = flutter.versionCode
         versionName = flutter.versionName
     }
+    signingConfigs {
+        release {
+            keyAlias = keystoreProperties['keyAlias']
+            keyPassword = keystoreProperties['keyPassword']
+            storeFile = keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
+            storePassword = keystoreProperties['storePassword']
+        }
+    }
 
     buildTypes {
         release {
-            // TODO: Add your own signing config for the release build.
-            // Signing with the debug keys for now, so `flutter run --release` works.
-            signingConfig = signingConfigs.getByName("debug")
+            signingConfig = signingConfigs.release
         }
     }
 }