fix dockerfile

 FROM golang:1.13 as builder
 FROM golang:1.13 as builder
-
 ENV GOPROXY https://goproxy.cn
 ENV GOPROXY https://goproxy.cn
 ENV GO111MODULE on
 ENV GO111MODULE on
 ENV GOPATH /go
 ENV GOPATH /go
-
-RUN git clone http://gitlab.fjmaimaimai.com/mmm-go/gocomm.git /go/src/gocomm
-RUN cd /go/src/gocomm \
+RUN git clone http://gitlab.fjmaimaimai.com/mmm-go/gocomm.git /go/src/gocomm \
+    && cd /go/src/gocomm \
     && git pull
     && git pull
 WORKDIR /go/src/opp
 WORKDIR /go/src/opp
-
-COPY go.mod .
-RUN go mod download
-
 COPY . .
 COPY . .
-RUN GOOS=linux CGO_ENABLED=0 go build -ldflags="-s -w"  -o opp main.go
-#EXPOSE 8080
-#CMD ["./opp"]
+RUN go mod download \
+    && GOOS=linux CGO_ENABLED=0 go build -ldflags="-s -w"  -o opp main.go
 
 
 FROM alpine:latest
 FROM alpine:latest
-
-RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
-RUN apk add --no-cache tzdata \
+RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories \
+    && apk add --no-cache tzdata \
     && ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime \
     && ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime \
     && echo "Asia/Shanghai" > /etc/timezone \
     && echo "Asia/Shanghai" > /etc/timezone \
-#    && rm -rf /var/cache/apk/* /tmp/* /var/tmp/* $HOME/.cache ## 清除缓存
+    && rm -rf /var/cache/apk/* /tmp/* /var/tmp/* $HOME/.cache ## 清除缓存
 WORKDIR /root/
 WORKDIR /root/
 COPY --from=builder /go/src/opp .
 COPY --from=builder /go/src/opp .
 EXPOSE 8080
 EXPOSE 8080