github-actions: add checkpatch

Signed-off-by: Kamil Gierszewski <kamil.gierszewski@huawei.com>

.checkpatch.conf

@@ -0,0 +1,9 @@
+--max-line-length=80
+--no-tree
+
+--ignore AVOID_BUG
+--ignore COMMIT_MESSAGE
+--ignore FILE_PATH_CHANGES
+--ignore PREFER_PR_LEVEL
+--ignore SPDX_LICENSE_TAG
+--ignore SPLIT_STRING

.github/workflows/checkpatch.yml

@@ -0,0 +1,15 @@
+name: checkpatch review
+on: [pull_request]
+jobs:
+  my_review:
+    name: checkpatch review
+    runs-on: ubuntu-latest
+    steps:
+    - name: 'Calculate PR commits + 1'
+      run: echo "PR_FETCH_DEPTH=$(( ${{ github.event.pull_request.commits }} + 1 ))" >> $GITHUB_ENV
+    - uses: actions/checkout@v3
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+        fetch-depth: ${{ env.PR_FETCH_DEPTH }}
+    - name: Run checkpatch review
+      uses: webispy/checkpatch-action@v9