I am creating a Slack notification for my build and I need the full commit SHA to generate some links. The only variable I see in the documentation is commit, which is a shortened SHA. However, I need the full SHA. Is there a variable, perhaps undocumented, that contains the full SHA?
I also tried: <https://testserver/?sha=$TRAVIS_COMMIT|Try on Staging>
But that just directly included $TRAVIS_COMMIT and did not try any interpolation.