Fix clang-format CI: add .clang-format, update workflow, format code

.clang-format

@@ -0,0 +1,13 @@
+Language: Cpp
+BasedOnStyle: Google
+IndentWidth: 2
+ColumnLimit: 80
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+BinPackArguments: true
+BinPackParameters: true
+BreakBeforeBraces: Attach
+DerivePointerAlignment: false
+PointerAlignment: Left
+SpacesBeforeTrailingComments: 1

.github/workflows/githubci.yml

@@ -3,7 +3,27 @@ name: Arduino Library CI
 on: [pull_request, push, repository_dispatch]
 
 jobs:
+  clang-format:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/setup-python@v4
+      with:
+        python-version: '3.x'
+    - uses: actions/checkout@v3
+    - uses: actions/checkout@v3
+      with:
+         repository: adafruit/ci-arduino
+         path: ci
+
+    - name: pre-install
+      run: bash ci/actions_install.sh
+
+    - name: clang
+      run: python3 ci/run-clang-format.py -e "ci/*" -e "bin/*" -r . 
+
   build:
+    needs: clang-format
     runs-on: ubuntu-latest
     
     steps: