Missing gitlab runner. Uploading artifacts is disabled.
We're using the parallels executor, and we got this error at the end of the build when we tried to use artifacts.
Judging from the commit message of https://gitlab.com/gitlab-org/gitlab-ci-multi-runner/commit/b37e032e4439a7caf92d5724871bc79b67779dfa, gitlab-ci-multi-runner must be present on the virtual machine and named gitlab-runner for this to work, but this doesn't seem to be documented. We copied it to the vm and it fixed the problem.
Also, the virtualbox documentation still states that caching is not supported.