add format check #225

Job	Run time
build (release-v4.4, calibration_helper)	2m 25s
format-check	1m 5s
build-arduino (release-v4.4, weather)	3m 12s
build (release-v4.4, demo)	2m 14s
build (release-v4.4, dragon)	2m 16s
build (release-v4.4, grayscale_test)	2m 21s
build (release-v4.4, www-image)	2m 23s
build (release-v5.1, calibration_helper)	2m 17s
build (release-v5.1, demo)	2m 13s
build (release-v5.1, dragon)	2m 18s
build (release-v5.1, grayscale_test)	2m 15s
build (release-v5.1, www-image)	2m 16s
build (release-v5.2, calibration_helper)	2m 17s
build (release-v5.2, demo)	2m 19s
build (release-v5.2, dragon)	2m 18s
build (release-v5.2, grayscale_test)	2m 18s
build (release-v5.2, www-image)	2m 26s
build (release-v5.1, screen_diag)	2m 16s
	41m 9s

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