sbox-public: run formatting on it's own runner

.github/workflows/pull_request_checks.yml

@@ -22,8 +22,6 @@ jobs:
         with:
           dotnet-version: '10.0.x'
 
-      - name: Format
-        run: dotnet run --project .\engine\Tools\SboxBuild\SboxBuild.csproj -- format --verify
 
       - name: Bootstrap
         run: .\Bootstrap.bat

public/.github/workflows/formatting.yml

@@ -0,0 +1,27 @@
+name: Formatting
+
+on:
+  pull_request:
+    branches: [ master ]
+
+permissions:
+  contents: read
+
+jobs:
+  format:
+    runs-on: [ windows-latest ]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          clean: true
+          fetch-depth: 1
+          persist-credentials: false
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: '10.0.x'
+
+      - name: Format
+        run: dotnet run --project .\engine\Tools\SboxBuild\SboxBuild.csproj -- format --verify