modernize workflow #231

Job	Run time
debug (clang)	3m 59s
arm (c99)	2m 29s
avr (c99)	2m 2s
arm (c11)	2m 39s
debug (gcc)	3m 54s
optimizations (clang, Release)	1m 36s
avr (c11)	2m 9s
arm (gnu99)	3m 2s
optimizations (clang, MinSizeRel)	1m 34s
avr (gnu99)	2m 31s
arm (gnu11)	2m 38s
avr (gnu11)	2m 44s
optimizations (gcc, Release)	1m 44s
sonar	1m 59s
optimizations (gcc, MinSizeRel)	1m 36s
style_check	12s
	36m 48s

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