feat: Set up Fastlane for Android with Firebase App Distribution and adjust build configurations.

android/app/build.gradle.kts

@@ -30,10 +30,7 @@ android {
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId = "be.devdayronvl.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
         targetSdk = flutter.targetSdkVersion
         versionCode = flutter.versionCode
@@ -45,16 +42,18 @@ android {
             keyAlias = keystoreProperties["keyAlias"] as String?
             keyPassword = keystoreProperties["keyPassword"] as String?
             storeFile = if (keystoreProperties["storeFile"] != null) {
-                file(keystoreProperties["storeFile"] as String)
+                rootProject.file(keystoreProperties["storeFile"] as String)
             } else {
                 null
             }
+            
             storePassword = keystoreProperties["storePassword"] as String?
         }
     }
 
     buildTypes {
         release {
+            // Applique la configuration de signature définie au-dessus
             signingConfig = signingConfigs.getByName("release")
         }
     }
@@ -66,4 +65,4 @@ dependencies {
 
 flutter {
     source = "../.."
-}
+}