Add runbook to debug release environments pipeline
- Add runbook to debug release environments pipeline
Ref: gitlab-com/gl-infra/delivery#20122 (closed)
Formated view for easy read: https://gitlab.com/gitlab-org/release/docs/-/blob/317a07ff01200d669ed70fd50c2234a0e8a5635c/runbooks/release-environment/debug-release-environments-pipeline.md