add formatting check

.github/workflows/format.yml

@@ -0,0 +1,24 @@
+name: Check formatting
+
+# ==== NOTE: do not rename this yml file or the run_number will be reset ====
+
+on:
+  pull_request:
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use .NET Core SDK
+        uses: actions/setup-dotnet@v4
+        with:
+          global-json-file: global.json
+          source-url: https://nuget.pkg.github.com/Shane32/index.json
+        env:
+          NUGET_AUTH_TOKEN: ${{secrets.GITHUB_TOKEN}}
+      - name: Install dependencies
+        run: dotnet restore
+      - name: Check formatting
+        run: |
+          dotnet format --no-restore --verify-no-changes --severity error || (echo "Run 'dotnet format' to fix issues" && exit 1)

GraphQL.DI.sln

@@ -24,6 +24,7 @@ EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Workflows", "Workflows", "{7432A0AF-9346-41D7-9DA9-D7EFEAF1A401}"
 	ProjectSection(SolutionItems) = preProject
 		.github\workflows\build.yml = .github\workflows\build.yml
+		.github\workflows\format.yml = .github\workflows\format.yml
 		.github\workflows\publish.yml = .github\workflows\publish.yml
 		.github\workflows\test.yml = .github\workflows\test.yml
 	EndProjectSection

global.json

@@ -3,4 +3,4 @@
     "version": "9.0.100",
     "rollForward": "latestMinor"
   }
-}
+}