fix: enable BUILD_ARGS in docker-buildx target (#170)

Makefile

@@ -95,7 +95,7 @@ PLATFORMS ?= linux/arm64,linux/amd64,linux/s390x,linux/ppc64le
 docker-buildx: ## Build and push docker image for the manager for cross-platform support
 	- docker buildx create --name project-v3-builder
 	docker buildx use project-v3-builder
-	- docker buildx build --push --platform=$(PLATFORMS) --tag ${IMG} -f Dockerfile .
+	- docker buildx build --push $(BUILD_ARGS) --platform=$(PLATFORMS) --tag ${IMG} -f Dockerfile .
 	- docker buildx rm project-v3-builder
 
 ##@ Deployment