add check-format

.github/workflows/check-format.yml

@@ -0,0 +1,15 @@
+name: Check source code formatting
+
+on:
+  push: {}
+  pull_request: {}
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    container: zhongruoyu/llvm-ports:17.0.4-slim-focal
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check .cpp and .hpp files
+        run: |
+          ./check_format.sh

check_format.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+check_diff() {
+    local status=0
+	  for file in "$@"; do
+		    if ! diff -q "$file" <(clang-format "$file"); then
+            status=1
+        fi
+	  done
+    return $status
+}
+
+export -f check_diff
+
+find . -type f \( -name "*.cpp" -o -name "*.hpp" \) ! -path "./build-env/*" ! -path "./.*" -exec bash -c 'check_diff "$@"' sh {} +