add '-latest' to release tag for branches #127

Job	Run time
build-docker-normal / build-docker-image (arm/v7)	49s
build-docker-normal / build-docker-image (amd64)	31s
build-docker-normal / build-docker-image (s390x)	44s
build-docker-normal / build-docker-image (arm64)	38s
build-docker-normal / build-docker-image (riscv64)	45s
build-docker-normal / build-docker-image (ppc64le)	27s
build-docker-normal / merge	24s
build-docker-minimal / build-docker-image (amd64)	26s
build-docker-minimal / build-docker-image (s390x)	28s
build-docker-minimal / build-docker-image (ppc64le)	24s
build-docker-minimal / build-docker-image (riscv64)	23s
build-docker-minimal / build-docker-image (arm/v7)	37s
build-docker-minimal / build-docker-image (arm64)	47s
build-docker-minimal / merge	17s
cleanup-docker	28s
	8m 8s

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