add '-latest' to release tag for branches #136

Job	Run time
build-docker-normal / build-docker-image (amd64)	50s
build-docker-normal / build-docker-image (riscv64)	51s
build-docker-normal / build-docker-image (s390x)	58s
build-docker-normal / build-docker-image (ppc64le)	37s
build-docker-normal / build-docker-image (arm/v7)	57s
build-docker-normal / build-docker-image (arm64)	45s
build-docker-normal / merge	52s
build-docker-minimal / build-docker-image (ppc64le)	25s
build-docker-minimal / build-docker-image (s390x)	35s
build-docker-minimal / build-docker-image (arm64)	33s
build-docker-minimal / build-docker-image (arm/v7)	39s
build-docker-minimal / build-docker-image (riscv64)	41s
build-docker-minimal / build-docker-image (amd64)	45s
build-docker-minimal / merge	18s
cleanup-docker	30s
	10m 16s

Provide feedback