## Why
CLI tools and the logviewer UI need ClickHouse access without write or DDL rights. The only existing app user (`vector`) has `access_management` and write access; this adds a properly scoped read-only login using the same secret-sourcing mechanism.
## Changes
- Adds a `logreader` user to the `logs` ClickHouseInstallation: password hash via `secretKeyRef` to the Vault-synced `clickhouse-logreader` Secret (same mechanism as `vector`), networks `::/0`, `readonly` profile, scoped to the `logs` database only
- Adds a `readonly` profile (`readonly: 1`, same memory/time limits as default)
- Adds a `clickhouse-logreader` VaultStaticSecret mirroring the existing `clickhouse-credentials` object (kv-v2, 5m refresh, VSO-created destination Secret)
## Vault kv
Seeded at `kv/kubernetes/namespace/logging/default/clickhouse-logreader` (version 1) with keys: `username`, `password`, `password_sha256_hex`. No secret material lands in git; the CHI only ever sees the sha256 hash via the synced Secret.
Reviewed-on: #400
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>
unkin-agent
cd51078d79