Add pre_clone_script, pre_build_script and post_build_script env variable
What does this MR do?
This MR adds the runners.pre_clone_script variable to create the RUNNER_PRE_CLONE_SCRIPT Environment variable.
Why was this MR needed?
Gitlab runner supports RUNNER_PRE_CLONE_SCRIPT environment variable according to this.
This MR cover gitlab-org/gitlab-runner#3723
What are the relevant issue numbers?
Edited by 🤖 GitLab Bot 🤖