feat(homelab): isolate PR runner and add Paperless

paperless/README.md

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+# Paperless-ngx
+
+Paperless-ngx runs in the `paperless` namespace. It uses the shared PostgreSQL
+service in the `database` namespace and Valkey for its task queue. The document
+library, exports, and consume folder are stored on the `local-path-retain`
+volume. The PVC size is fixed at 50 GiB because this storage class does not
+support volume expansion.
+
+The local route is `https://papers.workstation.internal`; the public route is
+`https://papers.forust.xyz`. Both use TLS. Paperless keeps its own login and
+password authentication. OCR is configured for Russian and English documents.
+
+## Prepare the secret
+
+Create `k8s/secrets.yaml` on the workstation from
+`k8s/secrets.yaml.example`. Set a unique random `PAPERLESS_SECRET_KEY`, a long
+`PAPERLESS_ADMIN_PASSWORD`, and `PAPERLESS_DB_PASSWORD`.
+
+Add the same `PAPERLESS_DB_PASSWORD` value to the local
+`postgres/k8s/secrets.yaml` file. Keep both secret files out of Git. The
+database bootstrap Job creates the `paperless` role and database from the
+shared PostgreSQL secret. The job runs in the `database` namespace and needs
+that namespace's existing `postgres-shared-secrets` Secret.
+
+For example, generate a key with:
+
+```sh
+python3 -c 'import secrets; print(secrets.token_urlsafe(64))'
+```
+
+Then apply the secret before enabling the service:
+
+```sh
+kubectl apply -f paperless/k8s/namespace.yaml
+kubectl apply -f postgres/k8s/secrets.yaml
+kubectl apply -f paperless/k8s/secrets.yaml
+```
+
+The normal deploy workflow applies the remaining manifests when
+`paperless/k8s/active` is present. Verify the rollout and ingress after deploy:
+
+```sh
+kubectl -n paperless rollout status deployment/paperless
+kubectl -n paperless get pods,pvc,services
+```
+
+Back up the `paperless-data` PVC and the shared PostgreSQL database. The PVC
+contains the originals, archived PDFs, and export/consume folders. Valkey has
+no persistent volume; queued tasks are recreated after a restart.