It uses docker based on alpine and the host nix store, so we can perform
builds but isolate them from the system.
Reviewed-by: Aleix Boné <abonerib@bsc.es>
Starting with GitLab 16, there is a new mechanism to authenticate the
runners via authentication tokens, so use it instead. Older tokens and
runners are also removed, as they are no longer used.
With the new way of managing tokens, both the tags and the locked state
are managed from the GitLab web page.
See: https://docs.gitlab.com/ee/ci/runners/new_creation_workflow.html
Reviewed-by: Aleix Boné <abonerib@bsc.es>
