Add format workflow

.editorconfig

@@ -34,7 +34,7 @@ csharp_style_expression_bodied_operators = true
 
 # Code-block preferences
 csharp_prefer_braces = false
-csharp_style_namespace_declarations = block_scoped
+csharp_style_namespace_declarations = file_scoped
 
 #### C# Formatting Rules ####
 

.github/workflows/Benchmark.yml

@@ -1,8 +1,9 @@
 name: Benchmark
 
-on: push
+on: [push, pull_request]
 jobs:
   Rendering:
+    if: (github.event_name == 'pull_request') == github.event.pull_request.head.repo.fork
     runs-on: windows-latest
     steps:
     - uses: actions/checkout@v6

.github/workflows/Format.yml

@@ -0,0 +1,16 @@
+name: Check format
+
+on: [push, pull_request]
+jobs:
+  Everything:
+    if: (github.event_name == 'pull_request') == github.event.pull_request.head.repo.fork
+    runs-on: windows-latest
+    steps:
+    - uses: actions/setup-dotnet@v5
+      with:
+        dotnet-version: '10.x'
+    - uses: actions/checkout@v6
+      with:
+        submodules: 'recursive'
+    - name: Check formatting
+      run: dotnet format --verify-no-changes

.github/workflows/Nightly.yml

@@ -1,8 +1,9 @@
 name: Upload test results and nightly builds
 
-on: push
+on: [push, pull_request]
 jobs:
   Everything:
+    if: (github.event_name == 'pull_request') == github.event.pull_request.head.repo.fork
     runs-on: windows-latest
     steps:
     - name: Update draft on GitHub Releases

.github/workflows/Test.yml

@@ -1,8 +1,9 @@
 name: Build and Test
 
-on: push
+on: [push, pull_request]
 jobs:
   Everything:
+    if: (github.event_name == 'pull_request') == github.event.pull_request.head.repo.fork
     strategy:
       fail-fast: false # Don't cancel other os builds if one fails
       matrix:

CSharpMath.sln

@@ -57,6 +57,7 @@ EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "workflows", "workflows", "{86C13BAB-EE19-4E82-B36F-2FEE92754B30}"
 	ProjectSection(SolutionItems) = preProject
 		.github\workflows\Benchmark.yml = .github\workflows\Benchmark.yml
+		.github\workflows\Format.yml = .github\workflows\Format.yml
 		.github\workflows\Nightly.yml = .github\workflows\Nightly.yml
 		.github\workflows\Release.yml = .github\workflows\Release.yml
 		.github\workflows\Test.yml = .github\workflows\Test.yml