fix: make binary error

Author: zhanglifang@chinatelecom.cn

Dockerfile

@@ -6,7 +6,7 @@ ADD . /go/src/github.com/DrmagicE/gmqtt
 WORKDIR /go/src/github.com/DrmagicE/gmqtt
 
 ENV GO111MODULE on
-ENV GOPROXY https://goproxy.cn
+#ENV GOPROXY https://goproxy.cn
 
 EXPOSE 1883 8883 8082 8083 8084
 

Makefile

@@ -128,7 +128,7 @@ test-all: test test-bench test-cover
 
 # Build Golang application binary with settings to enable it to run in a Docker scratch container.
 binary: generate-grpc
-	CGO_ENABLED=0 GOOS=linux go build  -ldflags '-s' -installsuffix cgo o $(BUILD_DIR)/gmqttd ./cmd/gmqttd
+	CGO_ENABLED=0 GOOS=linux go build  -ldflags '-s' -o $(BUILD_DIR)/gmqttd ./cmd/gmqttd
 
 build-docker:
-	docker build -t gmqtt .
+	docker build -t gmqtt/gmqttd .