We need to make sure that commit SHA that triggered the build via webhook is the same SHA that the repo is being checkout out.

Use case:

Dev-1 merges changes to repo 'a'. Within seconds, Dev-2 merges changes to repo 'a'.

Expectation:

Each commit triggers a separate build based on the webhook SHA that triggered the build.

Current result:

SHA of Jenkinsfile might be not the same as checkout code, since the merges might happen within seconds of each other.