myasnikovdaniil 4bb141f654 docs(postgres): name the trust anchor as the tenant actually sees it (#3463)
## What this PR does

Two documentation defects that both landed with the CA trust-anchor work
in #3407.

The Postgres README told a tenant to fetch `<release>.tenant-ca`. The
release name carries the `postgres-` prefix the application definition
applies, so the object is `postgres-<name>.tenant-ca`, and the postgres
chainsaw test shows exactly that for a resource named `test`. A tenant
following the README got `NotFound`. I confirmed the real name on a live
cluster while converting another engine onto the same contract.

The second is a comment in the controller and one in its RBAC chart,
both promising a companion `ValidatingAdmissionPolicy` that pins
sentinel writes to helm-controller. No such policy ships. It was
proposed in #3410 and rejected: authorizing by
`request.userInfo.username` duplicates RBAC in a more brittle form, and
the RBAC boundary already holds because no tenant role has any verb on
`internal.cozystack.io`. The comments now say that instead of pointing
at a guard that does not exist.

### Downstream repositories

Documentation only, no API or chart behaviour changes.
`cozystack/website` regenerates the Postgres reference page from this
README on the next stable tag, so no manual follow-up is needed there.

- [x] No downstream repository is affected by this change
- [ ] [cozystack/website](https://github.com/cozystack/website) -
follow-up:

### Release note

```release-note
docs(postgres): the tenant CA trust anchor is `postgres-<name>.tenant-ca`, not `<release>.tenant-ca`.
```


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Documentation**
* Updated PostgreSQL TLS setup instructions with the correct tenant CA
Secret name and retrieval command.
* Clarified that tenant-accessible Secrets contain only the CA
certificate, while the original Secret contains the private key.
* Clarified CA sentinel access controls, including tenant isolation and
helm-controller-managed behavior.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
2026-08-17 14:43:54 +05:00
2025-10-08 09:43:34 +05:00
2025-04-01 18:48:14 +02:00
2024-02-08 12:04:32 +01:00

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