Steve Xuereb authored Apr 11, 2018 and Kamil Trzciński committed Apr 03, 2019

When the user specifies `GIT_CLONE_PATH` environment variable inside of
the `.gitlab-ci.yml` if the path is valid it is used to clone and build.

`GIT_CLONE_PATH` takes precedence over the configured build dir and
the default build dir.

Closes #2211