E M 8f13be1dc4
chore: reduce GKE release test cluster provisioning time and cost
- Configure runners-ci node pool inline in the cluster resource instead
  of using remove_default_node_pool=true, eliminating the
  provision-then-delete cycle that added ~5 min to terraform apply
- Remove the separate infra pool; runners-ci is now the only pool on
  the critical path of cluster creation
- Set tests-pods pool min_node_count=0 so no node is provisioned at
  apply time — nodes scale up only when test pods are scheduled
- Enable spot instances on the tests-pods pool for ~60-91% cost saving
- Add 60 min job timeout to release-tests to bound hung cluster cost
- Add Terraform plugin cache keyed on the lock file to skip provider
  re-downloads on subsequent runs (~30-60s saved)
- Install gke-gcloud-auth-plugin via setup-gcloud to fix kubectl auth

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-04-24 09:46:59 +10:00
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