add clang-format to github action

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

.github/workflows/clang-format.yml

@@ -0,0 +1,33 @@
+name: "format code"
+
+# run on pull requests to develop
+on:
+  pull_request:
+    branches:
+      - master
+  push:
+    branches:
+      - master
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          # check out HEAD on the branch
+          ref: ${{ github.head_ref }}
+          # make sure the parent commit is grabbed as well, because
+          # that's what will get formatted (i.e. the most recent commit)
+          fetch-depth: 2
+      # format the latest commit
+      - uses: purduesigbots/clang-format-action@1
+        # use one of clang-format's supported styles or leave this out to use the style in your .clang-format file
+        with:
+          style: .clang-format
+      # commit the changes (if there are any)
+      - name: Commit changes
+        uses: stefanzweifel/[email protected]
+        with:
+          commit_message: apply clang-format changes
+          branch: ${{ github.head_ref }}