Build rules in Makefile for Cradio with Pro Micro RP2040. #321

Job	Run time
build / Fetch Build Keyboards	7s
build / Build (nice_nano_v2, corne_left)	2m 45s
build / Build (nice_nano_v2, corne_right)	2m 58s
build / Build (nice_nano_v2, lily58_left nice_view_adapter nice_view)	2m 55s
build / Build (nice_nano_v2, lily58_right nice_view_adapter nice_view)	2m 55s
build / Build (seeeduino_xiao_ble, zaphod_lite)	2m 56s
build / Build (nice_nano_v2, cradio_left, zmk-usb-logging)	2m 58s
build / Build (nice_nano_v2, cradio_right)	2m 42s
build / Build (seeeduino_xiao_ble, weejock, studio-rpc-usb-uart)	2m 55s
build / Build (seeeduino_xiao_ble, tern_ble)	2m 52s
build / Build (sparkfun_pro_micro_rp2040, cradio_left)	2m 41s
build / Merge Output Artifacts	4s
	28m 48s

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