Add pico-debug to board definition #150

Job	Run time
build (ubuntu-latest, examples/arduino-blink)	4m 23s
build (ubuntu-latest, examples/arduino-wifi-scan)	3m 29s
build (ubuntu-latest, examples/arduino-ota)	3m 49s
build (ubuntu-latest, examples/arduino-signed-ota)	3m 35s
build (ubuntu-latest, examples/arduino-external-libs)	1m 16s
build (windows-latest, examples/arduino-blink)	35m 6s
build (windows-latest, examples/arduino-wifi-scan)	24m 54s
build (windows-latest, examples/arduino-ota)	30m 42s
build (windows-latest, examples/arduino-signed-ota)	29m 13s
build (windows-latest, examples/arduino-external-libs)	22m 13s
build (macos-latest, examples/arduino-blink)	5m 19s
build (macos-latest, examples/arduino-wifi-scan)	4m 27s
build (macos-latest, examples/arduino-ota)	4m 35s
build (macos-latest, examples/arduino-signed-ota)	4m 50s
build (macos-latest, examples/arduino-external-libs)	1m 58s
	2h 59m 49s

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