make github action run on all pushes / prs #87

Job	Run time
build-arduino (release-v4.4, weather)	4m 9s
build (release-v4.4, calibration_helper)	3m 23s
build (release-v4.4, demo)	3m 25s
build (release-v4.4, dragon)	4m 20s
build (release-v4.4, grayscale_test)	4m 1s
build (release-v4.4, mpd_status)	3m 31s
build (release-v4.4, terminal)	3m 30s
build (release-v4.4, www-image)	4m 4s
build (release-v5.1, calibration_helper)	3m 22s
build (release-v5.1, demo)	3m 49s
build (release-v5.1, dragon)	4m 20s
build (release-v5.1, grayscale_test)	3m 57s
build (release-v5.1, mpd_status)	3m 40s
build (release-v5.1, terminal)	4m 4s
build (release-v5.1, www-image)	3m 54s
	57m 29s

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