Live on .228 the post_install `exec` steps failed with "crun: write
cgroup.procs: Permission denied / OCI permission denied": a `podman exec`
launched from archipelago.service can't place its child in the container's
cgroup (under the service's own slice). Wrap `exec` in
`systemd-run --user --scope --quiet --collect podman exec …` so it gets its own
delegated cgroup — same trick as `podman_user_scope` for pasta starts.
`copy_from_host` (a host-side `cp`, no in-container process) stays direct.
Without this only copy_from_host worked; indeedhub happened to be unaffected
(its image pre-bakes the nginx config so the exec steps were no-ops), but the
hook capability is only generally useful with exec working. hooks unit tests
pass; live verify on .228 next.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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