checkpatch: temporarily ignore results

The checkpatch tool fails to properly parse the kind of C++ code used in
the Arduino libraries. Do not treat this as an error for now; will be
replaced soon with a better solution.

Signed-off-by: Luca Burelli <l.burelli@arduino.cc>

Author: pillo79

.github/workflows/checkpatch.yml

@@ -18,6 +18,7 @@ jobs:
   my_review:
     name: checkpatch review
     runs-on: ubuntu-latest
+    continue-on-error: true
     steps:
     - name: 'Calculate PR commits + 1'
       run: echo "PR_FETCH_DEPTH=$(( ${{ github.event.pull_request.commits }} + 1 ))" >> $GITHUB_ENV