fix: CI — capture electron-builder error output as artifact for debugging

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: danishfareed

.github/workflows/build-desktop.yml

@@ -63,15 +63,35 @@ jobs:
 
       - name: Build Electron app (macOS)
         if: matrix.platform == 'mac'
-        run: DEBUG=electron-builder npx electron-builder --mac --publish always
+        id: build_mac
+        continue-on-error: true
+        run: npx electron-builder --mac --publish always 2>&1 | tee build-output.log
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          DEBUG: 'electron-builder'
 
       - name: Build Electron app (Windows)
         if: matrix.platform == 'win'
-        run: npx electron-builder --win --publish always
+        id: build_win
+        continue-on-error: true
+        run: npx electron-builder --win --publish always 2>&1 | tee build-output.log
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          DEBUG: 'electron-builder'
+
+      - name: Upload build log on failure
+        if: failure() || steps.build_mac.outcome == 'failure' || steps.build_win.outcome == 'failure'
+        uses: actions/upload-artifact@v4
+        with:
+          name: build-log-${{ matrix.platform }}
+          path: build-output.log
+
+      - name: Fail if build failed
+        if: steps.build_mac.outcome == 'failure' || steps.build_win.outcome == 'failure'
+        run: |
+          echo "::error::Electron builder failed. Check the uploaded build-output.log artifact."
+          tail -100 build-output.log
+          exit 1
 
   update-release:
     needs: build