gitlab-runner errors on some runners

I found that some runners produced an error on a job, but others did not. The error, which you can see in this example job is as follows:

$ podman login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
time="2023-10-05T15:32:04Z" level=warning msg="\"/\" is not a shared mount, this could cause issues or missing mounts with rootless containers"
cannot clone: Operation not permitted
Error: cannot re-exec process

I get this error on ci-runner-x86-09, ci-runner-x86-10, ci-runner-arm64-13, runner-s390x-11, runner-ppcle64-12

I do not get the error on: ci-runner-x86-02-main, runner-x86-03-main, runner-x86-02-large, these would succeed.

The ones that fail all seem to be osuosl.

The message appears to be suggesting there is a template backslash that snuck into the runner config.