Publish artifact

Author: TaeHagen

.github/workflows/build.yml

@@ -67,4 +67,9 @@ jobs:
       # First run is expected to fail until ffmpeg_kit_flutter_new is fixed.
       - name: Run Build Script
         run: |
-          flutter build apk --flavor alpha --debug --target-platform android-arm64
+          flutter build apk --flavor alpha --debug --target-platform android-arm64
+      
+      - uses: actions/upload-artifact@v4
+        with:
+          name: Alpha Debug APK
+          path: build/app/outputs/flutter-apk/app-alpha-debug.apk