ci: add release gate workflow for main

.github/workflows/release-gate.yml

@@ -0,0 +1,28 @@
+name: Release Gate
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  gate:
+    runs-on: windows-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 8.0.x
+
+      - name: Run Release Gate
+        shell: pwsh
+        run: |
+          powershell -ExecutionPolicy Bypass -File .\scripts\release-gate.ps1