chore(main): release 0.0.21

[cnpg-bot]

🤖 I have created a release beep boop

0.0.21 (2026-09-10)

⚠ BREAKING CHANGES

• operator: Server.spec.tier1.data, Server.spec.tier1.cache, Server.spec.tier2.cache and Server.spec.queue are removed and replaced by the required Server.spec.storage. Existing Server resources are invalid against the new CRD and must be rewritten. The old PVCs are retained but no longer used; migrating their contents into the unified volume is a manual procedure, documented in the "0.0.20 to 0.0.21" section of upgrade_notes.md.

Features

• compression: Allow configuring the Kopia compression policy (#189) (ce10e13)
• olm: Add the bundle and catalog images to the artifacts repository (#191) (1aaacd3), closes #188
• operator: Build a UBI variant of the operator image (#150) (cd24fdd)
• operator: Replace per-purpose PVCs with a single unified /klio PVC (#245) (40001ba)

Bug Fixes

• core: Add release-please marker to core plugin version (#131) (4a3b20c), closes #130
• core: Identify Kopia snapshots by a stable identity in verify and delete (#74) (e85d21b)
• deps: Update all non-major go dependencies (#116) (5270d42)
• deps: Update all non-major go dependencies (#142) (12cd4ba)
• deps: Update all non-major go dependencies (#153) (bd1e401)
• deps: Update all non-major go dependencies (#175) (930020b)
• deps: Update all non-major go dependencies (#181) (78cb4f5)
• deps: Update all non-major go dependencies (#210) (c2d06e7)
• deps: Update all non-major go dependencies (#226) (72c5cd6)
• deps: Update github.com/cloudnative-pg/cloudnative-pg/tests digest to a4bb263 (#225) (432c700)
• deps: Update kubernetes monorepo to v0.36.4 (#156) (a14763c)
• deps: Update kubernetes monorepo to v0.37.0 (#187) (026264c)
• deps: Update module sigs.k8s.io/controller-runtime to v0.25.0 (#223) (1891047)
• operator: Serve recovery restore hooks from the instance pod (#196) (616578a), closes #192

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