Resolve "gitlab-runner cache permission fix"

Summary

Fix gitlab-runner bug. the runner could not write to default /cache directory because of permission errors with IB hardened image. Configured new cache directory. Bug fixed in gitlab-runner package
https://repo1.dso.mil/platform-one/big-bang/apps/developer-tools/gitlab-runner/-/issues/5
https://repo1.dso.mil/platform-one/big-bang/apps/developer-tools/gitlab-runner/-/merge_requests/12

Closes #372 (closed)