Test to fix CI build issue.

Author: crankyoldgit

.github/workflows/Build.yml

@@ -32,6 +32,7 @@ jobs:
         python -m pip install --upgrade pip
         pip install --upgrade platformio
     - name: Build all the examples
+      uses: actions/checkout@v2
       env:
         PLATFORMIO_BUILD_CACHE_DIR: "../../.pio/buildcache"
       run: find . -name platformio.ini -type f | sed 's,/platformio.ini$,,' | xargs --verbose -n 1 pio run --jobs 2 --project-dir