Heads-up: newly-granted ACLs take ~1s to take effect — scripted PVE storage adds need a retry

Posting this as a note for anyone scripting PBS setup, since the symptom looks identical to several well-documented problems but has a different cause. Setup: PBS 4.2.5 in an unprivileged LXC, three standalone PVE 9.2.6 hosts, one per-host API token, Datastore.Backup on the datastore path. I scripted adding PBS as storage on all three hosts. All three failed with: Code: create storage failed:…