微调gateway dockerfile，临时目录问题

apps/gateway/Dockerfile

@@ -10,6 +10,8 @@ RUN apk update --no-cache && apk add --no-cache tzdata
 
 WORKDIR /build
 
+RUN mkdir -p /tmp && chmod 1777 /tmp
+
 ADD go.mod .
 ADD go.sum .
 RUN go mod download
@@ -24,7 +26,7 @@ COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certifi
 COPY --from=builder /usr/share/zoneinfo/Asia/Shanghai /usr/share/zoneinfo/Asia/Shanghai
 ENV TZ Asia/Shanghai
 
-RUN mkdir -p /tmp && chmod 1777 /tmp
+COPY --from=builder /tmp /tmp
 
 WORKDIR /app
 COPY --from=builder /app/gateway /app/gateway