fix: do not build unsigned desktop app bundles on every PR in ci. add manual option. (#5550)

.github/workflows/ci.yml

@@ -131,13 +131,4 @@ jobs:
         run: source ../../bin/activate-hermit && npm run test:run
         working-directory: ui/desktop
 
-  # Faster Desktop App build for PRs only
-  bundle-desktop-unsigned:
-    uses: ./.github/workflows/bundle-desktop.yml
-    permissions:
-      id-token: write
-      contents: read
-    needs: changes
-    if: (github.event_name == 'pull_request' || github.event_name == 'merge_group') && (needs.changes.outputs.code == 'true' || github.event_name != 'pull_request')
-    with:
-      signing: false
+