trying to solve this #26

Job	Run time
build-push (Makefile, false)	8m 41s
build-push-arm (false)	1m 47s
build-push (Makefile, true)	8m 32s
build-push-arm (true)	1m 54s
build-push (Makefile.debian7, false)	2m 22s
build-push (Makefile.debian7, true)	2m 21s
build-push (Makefile.debian8, false)	5m 17s
build-push (Makefile.debian8, true)	5m 36s
build-push (Makefile.debian9, false)	8m 19s
build-push (Makefile.debian9, true)	8m 50s
build-push (Makefile.debian10, false)	11m 59s
build-push (Makefile.debian10, true)	11m 38s
build-push (Makefile.debian11, false)	14m 5s
build-push (Makefile.debian11, true)	14m 6s
build-push (Makefile.debian12, false)	16m 31s
build-push (Makefile.debian12, true)	17m 4s
	2h 19m 2s

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