Setting DOCKER_DEFAULT_PLATFORM in make dev-docker so arm64 can build an amd64 containerwith and amd64 binary. (#12769)

GNUmakefile

@@ -158,7 +158,7 @@ dev-docker: linux
 	@echo "Pulling consul container image - $(CONSUL_IMAGE_VERSION)"
 	@docker pull consul:$(CONSUL_IMAGE_VERSION) >/dev/null
 	@echo "Building Consul Development container - $(CONSUL_DEV_IMAGE)"
-	@docker build $(NOCACHE) $(QUIET) -t '$(CONSUL_DEV_IMAGE)' --build-arg CONSUL_IMAGE_VERSION=$(CONSUL_IMAGE_VERSION) $(CURDIR)/pkg/bin/linux_amd64 -f $(CURDIR)/build-support/docker/Consul-Dev.dockerfile
+	@DOCKER_DEFAULT_PLATFORM=linux/amd64 docker build $(NOCACHE) $(QUIET) -t '$(CONSUL_DEV_IMAGE)' --build-arg CONSUL_IMAGE_VERSION=$(CONSUL_IMAGE_VERSION) $(CURDIR)/pkg/bin/linux_amd64 -f $(CURDIR)/build-support/docker/Consul-Dev.dockerfile
 
 # In CircleCI, the linux binary will be attached from a previous step at bin/. This make target
 # should only run in CI and not locally.