add subPath to volumeMount postgres-data

[xring]

Summary

• What changed?

add subPath to postgres-data volumeMount

• Why is this needed?

Full Deployment (with PostgreSQL + Redis) may fail because of lost+found:

The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.

The database cluster will be initialized with locale "en_US.utf8".
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".

Data page checksums are disabled.

initdb: error: directory "/var/lib/postgresql/data" exists but is not empty
initdb: detail: It contains a lost+found directory, perhaps due to it being a mount point.
initdb: hint: Using a mount point directly as the data directory is not recommended.
Create a subdirectory under the mount point.

Validation

• Backend tests passed
• Frontend typecheck/build passed
• OpenAPI SDK regenerated or checked when API contracts changed
• Smoke test run when relevant

Commands run:

kubectl apply -k deploy/k8s/overlays/with-infra/

Risk

• User-facing impact:
• Deployment or migration impact:
• Rollback approach:

Notes

• Related issue:
• Follow-up work:
• Docs or operator runbooks updated when behavior changed:

[CLAassistant]

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