Fix docker release as mips64le is not avail (coredns#6246)

Signed-off-by: Yong Tang <[email protected]>

Makefile.docker

@@ -34,7 +34,7 @@ GITHUB:=https://github.com/coredns/coredns/releases/download
 # mips is not in LINUX_ARCH because it's not supported by docker manifest. Keep this list in sync with the one in Makefile.release
 LINUX_ARCH:=amd64 arm arm64 mips64le ppc64le s390x riscv64
 DOCKER_IMAGE_NAME:=$(DOCKER)/$(NAME)
-DOCKER_IMAGE_LIST_VERSIONED:=$(shell echo $(LINUX_ARCH) | sed -e "s~[^ ]*~$(DOCKER_IMAGE_NAME):&\-$(VERSION)~g")
+DOCKER_IMAGE_LIST_VERSIONED:=$(shell echo $(LINUX_ARCH) | sed -e "s~mips64le ~~g" | sed -e "s~[^ ]*~$(DOCKER_IMAGE_NAME):&\-$(VERSION)~g")
 
 all:
 	@echo Use the 'release' target to download released binaries and build containers per arch, 'docker-push' to build and push a multi arch manifest.