Add arduino-lint CI check

Author: earlephilhower

.github/workflows/pr-or-master-push.yml

@@ -86,3 +86,10 @@ jobs:
         valgrind --leak-check=full --track-origins=yes -v --error-limit=no --show-leak-kinds=all --error-exitcode=999 ./wav
         valgrind --leak-check=full --track-origins=yes -v --error-limit=no --show-leak-kinds=all --error-exitcode=999 ./midi
 
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: arduino/arduino-lint-action@v1
+        with:
+          library-manager: 'update'