ci: add universal APK and stable download URL

.github/workflows/release.yml

@@ -41,15 +41,20 @@ jobs:
       - name: Generate localizations
         run: flutter gen-l10n
 
-      - name: Build release APKs
+      - name: Build release APKs (split per ABI)
         run: flutter build apk --release --split-per-abi
 
+      - name: Build universal APK
+        run: flutter build apk --release
+
       - name: Rename APKs
         run: |
           cd build/app/outputs/flutter-apk
           mv app-arm64-v8a-release.apk elcaju-${{ github.ref_name }}-arm64.apk
           mv app-armeabi-v7a-release.apk elcaju-${{ github.ref_name }}-armeabi-v7a.apk
           mv app-x86_64-release.apk elcaju-${{ github.ref_name }}-x86_64.apk
+          mv app-release.apk elcaju-${{ github.ref_name }}-universal.apk
+          cp elcaju-${{ github.ref_name }}-universal.apk elcaju-universal.apk
 
       - name: Create GitHub Release
         uses: softprops/action-gh-release@v2
@@ -58,4 +63,6 @@ jobs:
             build/app/outputs/flutter-apk/elcaju-${{ github.ref_name }}-arm64.apk
             build/app/outputs/flutter-apk/elcaju-${{ github.ref_name }}-armeabi-v7a.apk
             build/app/outputs/flutter-apk/elcaju-${{ github.ref_name }}-x86_64.apk
+            build/app/outputs/flutter-apk/elcaju-${{ github.ref_name }}-universal.apk
+            build/app/outputs/flutter-apk/elcaju-universal.apk
           generate_release_notes: true