* Add GitHub Actions to `gofmt -s -w` all `*.go` files
This PR adds GitHub Actions to `gofmt -s -w` all `*.go` files,
if any `*.go` files are touched on each commit.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
* Change go-mod-fmt to go-fmt
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>