Update format workflow to auto-commit fixes on PRs

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

Author: AngeloTadeucci

.github/workflows/format.yml

@@ -1,25 +1,32 @@
 name: Format
 
 on:
-  push:
-    branches: ["master"]
   pull_request:
     branches: ["master"]
 
+permissions:
+  contents: write
+
 jobs:
   format:
     runs-on: windows-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
+          token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 8.0.x
+          dotnet-version: 9
 
-      - name: Install dotnet-format tool
-        run: dotnet tool install -g dotnet-format --version "8.*" --add-source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet8/nuget/v3/index.json
+      - name: Run dotnet format
+        run: dotnet format whitespace
 
-      - name: Run dotnet-format
-        run: dotnet-format whitespace --verify-no-changes
+      - name: Commit changes
+        if: github.event_name != 'pull_request' || github.repository == github.event.pull_request.head.repo.full_name
+        uses: stefanzweifel/git-auto-commit-action@v5
+        with:
+          commit_message: "style: auto-format whitespace"