webapp-pattern ct/install pair: PGDG repo, database nexus with
least-privilege owner role, pg_hba allowlist restricted to the nexus
app LXC (explicit reject for everything else), pgvector created by the
installer, credentials/DSN summary in /root/nexus-db.credentials.
Idempotent re-runs keep role/db and do not rotate the password.
Host-side script that creates an unprivileged Debian 12 LXC, installs
Node.js + act_runner in host mode, and registers it against the Gitea
instance. Deploy logic lives in the repo's .gitea/workflows/deploy.yml
(deploy-as-code); the runner polls outbound, so no inbound port.
l.kirchner