dockerfile: edit timezone

Dockerfile

@@ -22,8 +22,6 @@ owner="yiping.xu"
 
 WORKDIR /app/kpt-tmr
 
-ENV TZ=Asia/Shanghai
-
 RUN rm -f /etc/localtime \
 && ln -sv /usr/share/zoneinfo/Asia/Shanghai /etc/localtime \
 && echo "Asia/Shanghai" > /etc/timezone