Pass the updater signing key to the verification build

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: sparkly-quasar

.github/workflows/windows-build.yml

@@ -47,6 +47,10 @@ jobs:
         uses: tauri-apps/tauri-action@v0
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # createUpdaterArtifacts is on in tauri.conf.json, so `tauri build`
+          # refuses to run without the updater signing key even here.
+          TAURI_SIGNING_PRIVATE_KEY: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY }}
+          TAURI_SIGNING_PRIVATE_KEY_PASSWORD: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY_PASSWORD }}
 
       - name: Upload installers
         uses: actions/upload-artifact@v4