no flatpak build for no upload

.github/workflows/flutter-build.yml

@@ -1627,6 +1627,7 @@ jobs:
     name: Build Flatpak ${{ matrix.job.target }}
     needs: [build-rustdesk-linux]
     runs-on: ${{ matrix.job.on }}
+    if: ${{ inputs.upload-artifact }}
     strategy:
       fail-fast: false
       matrix: