feat: add format check workflow

.github/workflows/format.yaml

@@ -0,0 +1,28 @@
+name: Check code formatting
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  clang_format:
+    name: 'Check code formatting'
+    runs-on: ubuntu-latest
+    container:
+      image: archlinux
+    steps:
+        - name: Checkout repository action
+          uses: actions/checkout@v4
+          with:
+            sparse-checkout: .github/actions
+
+        - name: Install clang
+          shell: bash
+          run:
+            sed -i 's/SigLevel    = Required DatabaseOptional/SigLevel    = Optional TrustAll/' /etc/pacman.conf
+            pacman --noconfirm --noprogressbar -Syyu
+            pacman --noconfirm --noprogressbar -Sy clang
+
+        - name: Run clang-format
+          shell: bash
+          run: clang-format --dry-run --Werror */**.{h,c}pp