Tomasz Maczukin authored Dec 21, 2017 and Alessio Caiazza committed Dec 21, 2017

Do not use `git config --local` as it's not available in git v1.7.1

Closes #2991

See merge request gitlab-org/gitlab-runner!790

(cherry picked from commit 006699dd)

28f888ae 🐛 Do not use git config --local it's not available on git 1.7.1