delete existing release if not latest #91

Job	Run time
build-docker-vcpkg-installed / build-docker-image (s390x)	29s
build-docker-vcpkg-installed / build-docker-image (ppc64le)	36s
build-docker-vcpkg-installed / build-docker-image (arm64)	40s
build-docker-vcpkg-installed / build-docker-image (amd64)	36s
build-docker-vcpkg-installed / build-docker-image (arm/v7)	23s
build-docker-vcpkg-installed / build-docker-image (riscv64)	24s
build-docker-vcpkg-installed / merge	27s
build-docker-vcpkg-installed / cleanup-docker	14s
build-docker-normal / build-docker-image (arm/v7)	15m 9s
build-docker-normal / build-docker-image (riscv64)	15m 9s
build-docker-normal / build-docker-image (arm64)	14m 58s
build-docker-normal / build-docker-image (amd64)	3m 27s
build-docker-normal / build-docker-image (ppc64le)	15m 0s
build-docker-normal / build-docker-image (s390x)	15m 5s
build-docker-normal / merge	1s
build-docker-normal / cleanup-docker	1s
build-docker-minimal	-1s
cleanup-docker-cache	1s
	1h 22m 39s

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