New runner creation workflow
The "registration token" workflow has been deprecated for a while, and GitLab intends to disable it in v17.0.
Reference: https://docs.gitlab.com/ee/ci/runners/new_creation_workflow.html
Ideally, to solve the issue, we should rebase Heptapod Runner on GitLab Runner 15.6 minimum, which will clearly be too short for Heptapod 17.0
The good news about this, according to the abovementioned reference, is that registration tokens will only be disabled in v17.0, with end removal scheduled for v18.0