Update build&push.yml

.github/workflows/build&push.yml

@@ -54,5 +54,5 @@ jobs:
         with:
           upload_url: ${{ steps.latest_release.outputs.upload_url }}
           asset_path: /home/runner/.ufbt/build/metroflip.fap
-          asset_name: metroflip-${{ env.VERSION }}.fap
+          asset_name: metroflip-${{ env.VERSION || 'latest' }}.fap
           asset_content_type: application/octet-stream