Gitlab.com now supports Bulk delete artifacts via API

[IsNull]

It is now possible to delete all job artifacts of a project via a single api call.

DELETE /projects/:id/artifacts

• https://docs.gitlab.com/ee/api/job_artifacts.html#delete-project-artifacts
• https://stackoverflow.com/a/70817349

[Lastique]

From the first link:

Job logs are never deleted.