build: use the new env setting method in github action (#3189)
build: use the new env setting method in github action (#3189)

* build: use the new env setting method in github action

Signed-off-by: Zheng Xiangsheng <86b53920241ddf9ae27a84e4620fda3038083636@gmail.com>

* modify go.mod to trigger the action, and the commit will roll back later

Signed-off-by: Zheng Xiangsheng <86b53920241ddf9ae27a84e4620fda3038083636@gmail.com>

* revert

Signed-off-by: Zheng Xiangsheng <86b53920241ddf9ae27a84e4620fda3038083636@gmail.com>

* add release-4.0 branch

Signed-off-by: Zheng Xiangsheng <86b53920241ddf9ae27a84e4620fda3038083636@gmail.com>
pingcap/pd,pingcap/pd