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Rancher Desktop 1.22.0 (macOS 26, arm): We're using:

docker run --rm --name alloydb-omni \
  -e POSTGRES_PASSWORD=postgres \
  -v ~/alloydb-data:/var/lib/postgresql/data \
  -v /Volumes/alloydb/cache:/var/cache/alloydb \
  -p 5432:5432 \
  --shm-size=1g \
  google/alloydbomni:17

/Volumes/alloydb

is an APFS (case insensitive) volume

2026-02-12 21:28:49.159 UTC [1] WARNING:  [g_ce_ssd_cache.c:1124]  Error[95] Operation not supported opening /var/cache/alloydb for writes.