ci: use right triggers for the workflows #130

Job	Run time
docker (linux/386, linux, 386, netgo)	1m 11s
docker (linux/386, linux, 386, netgo)	1m 11s
docker (linux/386, linux, 386, netgo)	1m 11s
docker (linux/amd64, linux, amd64, netgo)	1m 0s
docker (linux/amd64, linux, amd64, netgo)	1m 0s
docker (linux/amd64, linux, amd64, netgo)	1m 0s
docker (linux/arm/6, linux, arm, 6, netgo)	1m 13s
docker (linux/arm/6, linux, arm, 6, netgo)	1m 6s
docker (linux/arm/6, linux, arm, 6, netgo)	1m 25s
docker (linux/arm64, linux, arm64, netgo)	1m 7s
docker (linux/arm64, linux, arm64, netgo)	1m 13s
docker (linux/arm64, linux, arm64, netgo)	1m 7s
manifest	0s
manifest	0s
manifest	41s
readme	0s
readme	0s
readme	8s
	14m 33s

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