script.rpm.sh on scientific linux should return el repos
When gitlab-ci-multi-runner is installed on Scientific Linux 6 using:
curl -L https://packages.gitlab.com/install/repositories/runner/gitlab-ci-multi-runner/script.rpm.sh | sudo bash
The script installs repos from
https://packages.gitlab.com/runner/gitlab-ci-multi-runner/scientific/6/
which contain very old versions. It should probably better use standrd enterprise linux packages.