add formatting CI check

Author: samuelsadok

.github/workflows/formatting.yaml

@@ -0,0 +1,36 @@
+name: Clang-Format Check
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    paths:
+      - '**/*.cpp'
+      - '**/*.h'
+      - '**/*.hpp'
+
+jobs:
+  clang-format-check:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Install Clang-Format
+      run: sudo apt-get install -y clang-format
+
+    - name: Run Clang-Format Check
+      run: |
+        files=$(find . -name "*.cpp" -o -name "*.hpp" -o -name "*.h")
+        check_ignore=$(git -c core.excludesFile="format-ignore.txt" check-ignore --stdin --no-index --non-matching --verbose <<< "$files")
+        files=$(awk '/^::/ {print $2}' <<< "$check_ignore")
+
+        echo "Checking $(echo "$files" | wc -l) files"
+
+        if [ -n "$files" ]; then
+          clang-format -style=file -i $files
+          git diff --exit-code || (echo "Clang-Format check failed!" && exit 1)
+        else
+          echo "No files to check."
+        fi