feat: add GitHub Actions workflow for automated Play Store deployment

.github/workflows/deploy-playstore.yml

@@ -0,0 +1,55 @@
+name: Deploy to Play Store
+
+on:
+  push:
+    branches:
+      - release  # L'action se déclenche uniquement sur la branche 'release'
+
+jobs:
+  build_and_deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      # 1. Récupérer le code
+      - uses: actions/checkout@v4
+
+      # 2. Installer Java (requis pour Android build)
+      - uses: actions/setup-java@v4
+        with:
+          distribution: 'zulu'
+          java-version: '17'
+
+      # 3. Installer Flutter
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: 'stable'
+
+      # 4. Gérer les dépendances
+      - run: flutter pub get
+
+      # 5. Créer le Keystore depuis le secret (Décodage)
+      - name: Decode Keystore
+        run: |
+          echo "${{ secrets.ANDROID_KEYSTORE_BASE64 }}" | base64 --decode > android/app/upload-keystore.jks
+
+      # 6. Créer le fichier key.properties pour que Gradle trouve la clé
+      - name: Create key.properties
+        run: |
+          echo "storePassword=${{ secrets.ANDROID_KEYSTORE_PASSWORD }}" > android/key.properties
+          echo "keyPassword=${{ secrets.ANDROID_KEY_PASSWORD }}" >> android/key.properties
+          echo "keyAlias=${{ secrets.ANDROID_KEY_ALIAS }}" >> android/key.properties
+          echo "storeFile=upload-keystore.jks" >> android/key.properties
+
+      # 7. Construire l'AppBundle (.aab)
+      - name: Build AppBundle
+        run: flutter build appbundle --release
+
+      # 8. Uploader sur le Play Store (Track: alpha = Test fermé)
+      - name: Upload to Play Store
+        uses: r0adkll/upload-google-play@v1
+        with:
+          serviceAccountJsonPlainText: ${{ secrets.PLAY_STORE_CONFIG_JSON }}
+          packageName: be.devdayronvl.travel_mate
+          releaseFiles: build/app/outputs/bundle/release/app-release.aab
+          track: alpha # 'alpha' correspond souvent au Test Fermé. Sinon 'internal' ou 'beta'.
+          status: completed