## Summary
- Replace upstream `docker.io/library/redis:7-alpine` (Redis 7.4.8) with a nix-built container using Redis 8.2.3 from nixpkgs
- Introduce **attached service pattern**: `parent` field in service-versions.yaml, `<parent>-<component>` naming convention, and `assert pkgs.redis.version == version` in default.nix to prevent silent version drift on `flake.lock` updates
- Document the pattern in [[review-services]] so future attached services slot in cleanly
- Backfill `parent: grafana` on existing `grafana-sidecar` entry
## Version drift protection
1. `flake.lock` update bumps nixpkgs redis → `assert` in `default.nix` breaks `nix-build`
2. Developer updates `version` in `default.nix` → prek's `container-version-check` demands matching `service-versions.yaml` update
3. Both must agree before commit succeeds
## Test plan
- [ ] Build container from branch on ringtail (`mise run container-build-and-release authentik-redis`)
- [ ] Update kustomization `newTag` to branch-built image tag
- [ ] Sync authentik ArgoCD app from branch (`argocd app set authentik --revision localize-redis && argocd app sync authentik`)
- [ ] Verify Authentik login, session persistence, and task queue still work
- [ ] After merge: C0 follow-up to update `newTag` to the main-built image tag
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Reviewed-on: #309
