TPA-RFC-58: install a podman runner
we have two places where we feel we might be able to do more with podman as a runner backend instead of docker: * https://gitlab.torproject.org/tpo/tpa/gitlab/-/issues/90 - building images required user namespaces (and, in general, privileged containers, see also https://gitlab.torproject.org/tpo/tpa/container-images/-/merge_requests/1) * https://gitlab.torproject.org/tpo/tpa/team/-/issues/41295 - intermittent docker failures Obviously, introducing a new podman runner could raise new issues, but it's something we've been meaning to do for a while and if it has the chance of fixing things, it seems worth a try. This, obviously, would need to run bookworm to get the latest and greatest podman that works with GitLab. Update: VM and runner deployed, limited to jobs tagged with `podman`, testing requested on tor-project with https://gitlab.torproject.org/tpo/tpa/team/-/wikis/policy/tpa-rfc-58-podman-runner
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