Improvement
GitHub Actions: You can now disable repo level self-hosted runners in an Enterprise and Organization

Summary
Enterprise administrators can now disable repository level self-hosted runners across organizations and enterprise user namespaces. Once this new setting has been enabled users will no longer be able to register…
Enterprise administrators can now disable repository level self-hosted runners across organizations and enterprise user namespaces.
Once this new setting has been enabled users will no longer be able to register new self-hosted runners in a repository and existing runners will not be able to receive new jobs.
Learn more about Disabling or limiting GitHub Actions for your organization