Stop build kit container after finishing (#130)

diff --git a/Makefile b/Makefile
index 1642395..83a1447 100644
--- a/Makefile
+++ b/Makefile
@@ -139,12 +139,16 @@
 	fi
 
 .PHONY: docker
+docker: PUSH_OR_LOAD = --load
+docker: PLATFORMS =
 docker:
-	docker buildx create --use
-	docker buildx build $(PUSH) --platform linux/386,linux/amd64,linux/arm64 --build-arg VERSION=$(VERSION) . -t $(HUB)/$(APP_NAME):$(VERSION) -t $(HUB)/$(APP_NAME):latest
+	docker buildx create --use --driver docker-container --name skywalking_cli > /dev/null 2>&1 || true
+	docker buildx build $(PUSH_OR_LOAD) $(PLATFORMS) --build-arg VERSION=$(VERSION) . -t $(HUB)/$(APP_NAME):$(VERSION) -t $(HUB)/$(APP_NAME):latest
+	docker buildx rm skywalking_cli
 
 .PHONY: docker.push
-docker.push: PUSH = --push
+docker.push: PUSH_OR_LOAD = --push
+docker.push: PLATFORMS = --platform linux/386,linux/amd64,linux/arm64
 docker.push: docker
 
 .PHONY: install