Add hived tag to shared_tags for proper build concurrency

Dan Notesteinrequested to merge
fix-hived-build-concurrency-tags into develop

The hived tag routes to runners with limit=1 to prevent OOM issues during memory-intensive hived builds.

This affects all jobs using the shared_tags anchor:

  • prepare_base_images
  • prepare_haf_image
  • prepare_hivemind_image
  • publish job

Merge request reports