Update arduino_test_runner.yml

Author: ripred

.github/workflows/arduino_test_runner.yml

@@ -12,10 +12,13 @@ jobs:
       - uses: actions/checkout@v3
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.1' # Or your preferred version
+          ruby-version: '3.1'
 
       - name: Install arduino_ci gem
         run: gem install arduino_ci
 
+      - name: Add Ruby Gems to PATH
+        run: echo "$(ruby -e 'print Gem.bindir')" >> $GITHUB_PATH
+
       - name: Run Arduino CI tests
         run: arduino_ci