add clang format to CI

.clang-format

@@ -0,0 +1,12 @@
+BasedOnStyle: Google
+
+AccessModifierOffset: -1
+DerivePointerAlignment: false
+
+IndentWidth: 2
+ColumnLimit: 100
+
+IncludeBlocks: Preserve
+SortIncludes: false
+
+AllowShortFunctionsOnASingleLine: Empty

.gitea/workflows/check-format.yml

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+name: Clang-format Check
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  clang-format-check:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Install clang-format
+      run: sudo apt-get install -y clang-format
+
+    - name: Check code formatting
+      run: |
+        find . -type f -regex '.*\.\(cpp\|hpp\|c\|h\)' -exec clang-format -style=file -i {} \;
+        git diff --exit-code