ci: upload Windows artifacts for debugging

Upload the built .exe and blockmap as workflow artifacts so we can
inspect them even when electron-builder skips publishing to an
older release.

_Generated with mux_

Author: ibetitsmike

.github/workflows/release.yml

@@ -217,6 +217,15 @@ jobs:
           EV_TSA_URL: ${{ vars.EV_TSA_URL }}
           GCLOUD_ACCESS_TOKEN: ${{ steps.gcloud_auth.outputs.access_token }}
 
+      - name: Upload Windows artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: windows-release
+          path: |
+            release/*.exe
+            release/*.exe.blockmap
+          if-no-files-found: error
+
   notify-discord:
     name: Notify Discord
     runs-on: ubuntu-latest