added ci/cd integration for flutter app

.github/workflows/flutter_build_test.yml

@@ -0,0 +1,41 @@
+name: Flutter Build Test
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: Build Flutter App
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          submodules: true # Ensures the Flutter submodule is checked out
+
+      - name: Set up Java 17
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+
+      - name: Set up Flutter
+        run: |
+          echo "Adding Flutter to PATH"
+          echo "$GITHUB_WORKSPACE/flutter/bin" >> $GITHUB_PATH
+          flutter/bin/flutter doctor
+
+      - name: Install dependencies
+        run: flutter/bin/flutter pub get
+
+      - name: Build APK (Release)
+        run: flutter/bin/flutter build apk --release
+
+      - name: Build App Bundle (AAB)
+        run: flutter/bin/flutter build appbundle --release