ci: Migrate Android Play Store deployment from GitHub Actions to Jenkins using Fastlane.

android/fastlane/Fastfile

@@ -0,0 +1,16 @@
+default_platform(:android)
+
+platform :android do
+  desc "Deploy to Internal Testing"
+  lane :deploy_internal do
+    # Build de l'application
+    sh "cd ../.. && flutter build appbundle --release"
+
+    # Upload vers Google Play
+    upload_to_play_store(
+      track: 'internal', # 'internal' = Test interne, 'alpha' = Test fermé
+      aab: '../build/app/outputs/bundle/release/app-release.aab',
+      json_key: ENV['GOOGLE_JSON_KEY_PATH'] # Jenkins remplit cette variable magiquement
+    )
+  end
+end