Add tf-a-lts-verified-propagater.yaml

This job is triggered whenever a patch in the lts branch get a Verified score.
It will vote the same score to the dependent patches.

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: I5fc9e92899b5c77f93d3a5140ac1519680b97c76
1 file changed