The hermes container reaches the host signal-cli daemon via podman's
host.containers.internal alias (127.0.0.1 in the container is not the host).
SIGNAL_ACCOUNT/SIGNAL_ALLOWED_USERS come from the git-ignored .env (the phone
number is personal, not committed). Move the data volume to a dank-owned path
(/opt is root-owned and not writable by the run user).