add clang-format action

Signed-off-by: peter <[email protected]>
Signed-off-by: Hanqing Wu <[email protected]>

.github/workflows/clang-format.yaml

@@ -0,0 +1,32 @@
+name: Code Fomatter
+
+# run on pull requests to develop
+on:
+  pull_request
+
+jobs:
+  format:
+    name: Clang Formatter
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          ref: ${{ github.head_ref }}
+          # fetch everything to be able to compare with any ref
+          fetch-depth: 0
+
+      - name: Check 
+        env:
+          LANG: "C.UTF-8"
+          LC_ALL: "C.UTF-8"
+          LANGUAGE: "C.UTF-8"
+        run: |
+          sudo apt install -y clang-format-15 python3 git
+          diff_output_file=$(mktemp)
+          git --no-pager diff -U0 --diff-filter=ACMRT ${{github.event.pull_request.base.sha}} ${{ github.event.pull_request.head.sha }} | clang-format-diff-15 -p1 2>&1 | tee $diff_output_file
+          if [ -s $diff_output_file ]; then
+              exit 1
+          else
+              exit 0
+          fi
+