Add smoketest

Author: sago35

Makefile

@@ -296,6 +296,7 @@ smoketest:
 	$(TINYGO) build -size short -o test.hex -target=wioterminal         examples/blinky1
 	@$(MD5SUM) test.hex
 	$(TINYGO) build -size short -o test.hex -target=pygamer             examples/blinky1
+	$(TINYGO) build -size short -o test.hex -target=xiao                examples/blinky1
 	@$(MD5SUM) test.hex
 ifneq ($(AVR), 0)
 	$(TINYGO) build -size short -o test.hex -target=atmega1284p         examples/serial