Fix curl connection reset on registry upload

Discard response body with --output NUL and capture HTTP status code
via --write-out to avoid curl failing on connection reset after upload.

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

.gitea/workflows/build.yml

@@ -27,6 +27,10 @@ jobs:
 
       - name: Publish to Gitea generic registry
         run: |
-          curl.exe --fail --user "${{ secrets.REGISTRY_USERNAME }}:${{ secrets.REGISTRY_TOKEN }}" `
+          $status = curl.exe --silent --user "${{ secrets.REGISTRY_USERNAME }}:${{ secrets.REGISTRY_TOKEN }}" `
             --upload-file dist\es24n_conf.exe `
+            --output NUL `
+            --write-out "%{http_code}" `
             "${{ github.server_url }}/api/packages/${{ github.repository_owner }}/generic/es24n-conf-windows/${{ github.run_number }}/es24n_conf.exe"
+          Write-Host "HTTP status: $status"
+          if ($status -ne "201") { exit 1 }