It is recommended to pin github actions with hash so that an action
is not posing an unknown security risk (as the actions itself is not
written by us).
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
use reviewdog to automatically suggest whitespace corrections in PRs
so that code will be clean before committing into master branch.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>