[Build, CI]: Add a GitHub Action to run the checkpatch.pl script

Signed-off-by: Martin Belanger <[email protected]>

.checkpatch.conf

@@ -0,0 +1,16 @@
+# This isn't actually a Linux kernel tree
+--no-tree
+
+--ignore EMAIL_SUBJECT
+--ignore FILE_PATH_CHANGES
+
+#--ignore CONFIG_DESCRIPTION
+#--ignore GERRIT_CHANGE_ID
+#--ignore GIT_COMMIT_ID
+#--ignore NEW_TYPEDEFS
+#--ignore SPDX_LICENSE_TAG
+#--ignore SPACING
+#--ignore CONST_STRUCT
+#--ignore EMBEDDED_FUNCTION_NAME
+#--exclude externals
+#--exclude examples

.github/workflows/checkpatch.yml

@@ -0,0 +1,15 @@
+name: checkpatch review
+on: [pull_request]
+jobs:
+  checkpatch:
+    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@v4
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+        fetch-depth: ${{ env.PR_FETCH_DEPTH }}
+    - name: Run checkpatch review
+      uses: webispy/checkpatch-action@v9