remove S6 settings which are no longer necessary / startup service improvements #77

Job	Run time
Test / Prepare workflow environment	7s
Test / Build nohealthcheck (linux/arm/v7)	1m 44s
Test / Build nohealthcheck (linux/arm64)	2m 11s
Test / Build (manifest)	2m 36s
Test / Build nohealthcheck (manifest)	2m 12s
Test / Build nohealthcheck (linux/amd64)	1m 7s
Test / Build (linux/arm/v7)	1m 47s
Test / Build (linux/arm64)	1m 55s
Test / Build (linux/amd64)	55s
	14m 34s

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