error check code signing

.github/workflows/compile.yaml

@@ -32,6 +32,11 @@ jobs:
         $cert = Get-ChildItem -Path Cert:\CurrentUser\My -CodeSigningCert | Select-Object -First 1
         if ($null -eq $cert) { throw "Code signing certificate not found" }
         Set-AuthenticodeSignature -FilePath ./winutil.ps1 -Certificate $cert
+    - name: Verify code signature
+      shell: pwsh
+      run: |
+        $signature = Get-AuthenticodeSignature -FilePath ./winutil.ps1
+        if ($signature.Status -ne 'Valid') { throw "Code signing failed" }
     - name: Upload winutil.ps1 as artifact
       uses: actions/upload-artifact@v2
       with: