Add verification of docker buildx support

Makefile

@@ -24,11 +24,10 @@ ifndef VERBOSE
 endif
 
 # set default shell
-SHELL = /bin/bash
+SHELL=/bin/bash -o pipefail
 
 # Use the 0.0 tag for testing, it shouldn't clobber any release builds
 TAG ?= master
-DOCKER ?= docker
 
 # Use docker to run makefile tasks
 USE_DOCKER ?= true
@@ -107,7 +106,7 @@ container: clean-container .container-$(ARCH) ## Build image for a particular ar
 
 # internal task to build image for a particular arch.
 .PHONY: .container-$(ARCH)
-.container-$(ARCH):
+.container-$(ARCH): init-docker-buildx
 	mkdir -p $(TEMP_DIR)/rootfs
 	cp bin/$(ARCH)/nginx-ingress-controller $(TEMP_DIR)/rootfs/nginx-ingress-controller
 	cp bin/$(ARCH)/dbg $(TEMP_DIR)/rootfs/dbg
@@ -118,24 +117,27 @@ container: clean-container .container-$(ARCH) ## Build image for a particular ar
 	$(SED_I) "s|VERSION|$(TAG)|g" $(DOCKERFILE)
 
 	echo "Building docker image..."
-	$(DOCKER) buildx build \
+	# buildx assumes images are multi-arch
+	docker buildx build \
 		--no-cache \
+		--pull \
 		--load \
 		--progress plain \
 		--platform linux/$(ARCH) \
 		-t $(MULTI_ARCH_IMAGE):$(TAG) $(TEMP_DIR)/rootfs
 
 .PHONY: clean-container
 clean-container: ## Removes local image
-	@$(DOCKER) rmi -f $(MULTI_ARCH_IMAGE):$(TAG) || true
+	echo "removing old image $(MULTI_ARCH_IMAGE):$(TAG)"
+	@docker rmi -f $(MULTI_ARCH_IMAGE):$(TAG) || true
 
 .PHONY: push
 push: .push-$(ARCH) ## Publish image for a particular arch.
 
 # internal task
 .PHONY: .push-$(ARCH)
 .push-$(ARCH):
-	$(DOCKER) push $(MULTI_ARCH_IMAGE):$(TAG)
+	docker push $(MULTI_ARCH_IMAGE):$(TAG)
 
 .PHONY: build
 build: check-go-version ## Build ingress controller, debug tool and pre-stop hook.
@@ -282,3 +284,14 @@ run-ingress-controller: ## Run the ingress controller locally using a kubectl pr
 .PHONY: check-go-version
 check-go-version:
 	@hack/check-go-version.sh
+
+.PHONY: init-docker-buildx
+init-docker-buildx:
+ifeq ($(DIND_TASKS),)
+ifneq ($(shell docker buildx 2>&1 >/dev/null; echo $?),)
+$(error "buildx not vailable. Docker 19.03 or higher is required")
+endif
+	docker run --rm --privileged docker/binfmt:66f9012c56a8316f9244ffd7622d7c21c1f6f28d
+	docker buildx create --name ingress-nginx --use || true
+	docker buildx inspect --bootstrap
+endif