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.
A reboot before the first deploy would leave the enabled unit in failed
state; the condition keeps it inert until start.sh exists (same guard as
nexus-worker.service).
- new install/nexus-runtime.sh (idempotent, re-runnable on an existing
LXC): uv for the nexus user (manages Python 3.12), tesseract deu+eng,
nexus-worker.service unit (ConditionPathExists guards the skeleton
phase), sudoers extended to cover the worker service
- nexus-install.sh: RUNTIME section now invokes nexus-runtime.sh at the
end of the install (after base sudoers/units, which it extends)
Installs Node.js and act_runner in host mode, registers the runner as
the unprivileged webapp user, and wires up systemd units for the runner
and the next-start service. A narrow sudoers rule lets the runner restart
only webapp.service; the build/deploy itself is driven by the repo workflow.
l.kirchner