Docker build tweaks

debian/changelog

@@ -1,5 +1,5 @@
-step-certificates (0.8.4-14-ge72f087-dev) unstable; urgency=medium
+step-certificates (0.15.1~rc.1~2~gd073a0a~dev) unstable; urgency=medium
 
   * See https://github.com/smallstep/certificates/releases
 
- -- Smallstep Labs, Inc. <techadmin@smallstep.com>  Wed, 20 Feb 2019 20:44:25 +0000
+ -- Smallstep Labs, Inc. <techadmin@smallstep.com>  Tue, 18 Aug 2020 18:40:32 +0000

make/docker.mk

@@ -21,14 +21,14 @@ DOCKER_IMAGE_NAME = smallstep/step-ca
 docker-prepare:
 	# Ensure, we can build for ARM architecture
 ifeq (linux,$(DOCKER_CLIENT_OS))
-	[ -f /proc/sys/fs/binfmt_misc/qemu-arm ] || docker run --rm --privileged docker/binfmt:a7996909642ee92942dcd6cff44b9b95f08dad64
+	[ -f /proc/sys/fs/binfmt_misc/qemu-arm ] || docker run --rm --privileged linuxkit/binfmt:v0.8-amd64
 endif
 
 	# Register buildx builder
 	mkdir -p $$HOME/.docker/cli-plugins
 
 	test -f $$HOME/.docker/cli-plugins/docker-buildx || \
-		(wget -O $$HOME/.docker/cli-plugins/docker-buildx https://github.com/docker/buildx/releases/download/v0.4.1/buildx-v0.4.1.$(DOCKER_CLIENT_OS)-amd64 && \
+		(wget -q -O $$HOME/.docker/cli-plugins/docker-buildx https://github.com/docker/buildx/releases/download/v0.4.1/buildx-v0.4.1.$(DOCKER_CLIENT_OS)-amd64 && \
 		chmod +x $$HOME/.docker/cli-plugins/docker-buildx)
 
 	# Called directly instead of via `docker buildx` because