Add support for tmpfs on the job container.
What does this MR do?
For the sake of completeness, add TMPFS support for the job container. This completes @mion00 work on https://gitlab.com/gitlab-org/gitlab-ci-multi-runner/merge_requests/605.
Why was this MR needed?
See #1454
Are there points in the code the reviewer needs to double check?
No.
Does this MR meet the acceptance criteria?
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Documentation created/updated - Tests
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Added for this feature/bug -
All builds are passing
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Branch has no merge conflicts with master
(if you do - rebase it please)