Build Windows client packages on Linux runner

.gitea/workflows/client-build.yml

@@ -34,7 +34,9 @@ jobs:
   build-client-windows:
     needs: validate-client
     if: startsWith(github.ref, 'refs/tags/v') || (github.event_name == 'workflow_dispatch' && inputs.build_windows == 'true')
-    runs-on: windows:host
+    # .NET can publish a self-contained Windows x64 client from Linux.
+    # This keeps releases independent of a Windows Gitea runner.
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4