OpenCloud: bump to v8.1.0, rebuild search index on upgrade
OpenCloud 8 rebuilds the search index during the update; large instances can take an hour or more (safe to interrupt), and older files are missing from search until it finishes.
Take a backup of the container, ideally in stop mode (/etc/opencloud and /var/lib/opencloud hold all OpenCloud state)
After search finds older files again, remove the old index with rm -rf /var/lib/opencloud/search/bleve

