Add shutdown #8

Job	Run time
build (examples/factory)	1m 54s
build (examples/test_BHI260AP)	1m 45s
build (examples/test_EPD)	1m 53s
build (examples/test_factory)	1m 48s
build (examples/test_GPS)	1m 54s
build (examples/test_keypad)	1m 55s
build (examples/test_lora_recv)	1m 53s
build (examples/test_lora_send)	1m 54s
build (examples/test_LTR_553ALS)	1m 37s
build (examples/test_lvgl)	1m 53s
build (examples/test_sd)	1m 54s
build (examples/test_touchpad)	1m 54s
build (examples/test_wifi)	1m 54s
	24m 8s

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