Add format check action workflow

Author: PythonGermany

.github/workflows/check-format.yml

@@ -0,0 +1,64 @@
+name: Check clang format
+
+on:
+  push:
+    branches:
+      - '*'
+  pull_request:
+    branches:
+      - '*'
+
+jobs:
+  format-check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Cache Clang-Format
+        uses: actions/cache@v4
+        with:
+          path: /usr/bin/clang-format
+          key: ${{ runner.os }}-clang-format-cache
+          restore-keys: |
+            ${{ runner.os }}-clang-format-cache
+
+      - name: Set up Clang-Format
+        run: |
+          if ! command -v clang-format &> /dev/null; then
+            echo "Clang-Format not found, installing..."
+            sudo apt-get update
+            sudo apt-get install -y clang-format
+          else
+            echo "Clang-Format is already installed."
+          fi
+
+      - name: Check formatting
+        run: |
+          # Find all C/C++ files and check formatting
+          files=$(find . -name '*.h' -o -name '*.c' -o -name '*.hpp' -o -name '*.cpp')
+          if [ -z "$files" ]; then
+            echo "No C/C++ files found."
+            exit 0
+          fi
+
+          # Initialize a flag to track formatting issues
+          formatting_issues=0
+
+          # Check formatting for each file
+          for file in $files; do
+            if clang-format -style=file -output-replacements-xml "$file" | grep -q '<replacement '; then
+              echo "Formatting issues found in $file"
+              formatting_issues=1
+            fi
+          done
+
+          # Exit with the appropriate status code
+          if [ $formatting_issues -eq 1 ]; then
+            echo "Please format the files using clang-format and commit the changes."
+            exit 1
+          else
+            echo "All files are properly formatted."
+            exit 0
+          fi