test dotnet format for only changed files

.github/workflows/linter.yml

@@ -42,5 +42,22 @@ jobs:
       - name: Run dotnet restore
         run: dotnet restore
 
-      - name: Run dotnet format
-        run: dotnet format --verify-no-changes --no-restore
+      - name: Fetch all history for all branches and tags
+        run: git fetch --prune --unshallow
+
+
+      - name: Determine changed files
+        id: changed-files
+        run: |
+          PR_NUMBER=$(echo "${{ github.event.number }}" | tr -d '\n')
+          PR_FILES=$(curl -s "https://api.github.com/repos/${{ github.repository }}/pulls/$PR_NUMBER/files" | jq -r '.[].filename')
+          echo "CHANGED_FILES=$PR_FILES" >> $GITHUB_ENV
+
+      - name: Run dotnet format on changed files
+        run: |
+          for file in $CHANGED_FILES; do
+            if [[ $file == *.cs ]]; then
+              echo "Formatting $file"
+              dotnet format $file --include $file --verify-no-changes --no-restore
+            fi
+          done