added CI build test also for mac and windows

.github/workflows/ci.yml

@@ -6,7 +6,11 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    runs-on: ${{ matrix.os }}
 
     steps:
       - name: Checkout Code
@@ -21,4 +25,5 @@ jobs:
           arduino-cli core install arduino:renesas_uno
           
       - name: Compile Sketch (via Makefile)
+        shell: bash
         run: make compile

Makefile

@@ -1,14 +1,18 @@
+PORT ?= /dev/ttyACM0
+BOARD = arduino:renesas_uno:unor4wifi
+SKETCH = arduino_pong.ino
+
 compile:
-	arduino-cli compile -b arduino:renesas_uno:unor4wifi ./arduino_pong.ino
+	arduino-cli compile -b $(BOARD) $(SKETCH)
 
 upload:
-	arduino-cli upload -b arduino:renesas_uno:unor4wifi -p /dev/ttyACM0
+	arduino-cli upload -b $(BOARD) -p $(PORT)
 
 upload_verbose:
-	arduino-cli upload -b arduino:renesas_uno:unor4wifi -p /dev/ttyACM0 -v
+	arduino-cli upload -b $(BOARD) -p $(PORT) -v
 
 monitor:
-	arduino-cli monitor -p /dev/ttyACM0
+	arduino-cli monitor -p $(PORT)
 
 run:
 	make compile