The stored password is the default. Before, a local REDIS_PASSWORD was
rewritten to the stored password, and a shared one replaced the stored
password, so the old password was lost.
- A local, shared, or remote secret REDIS_PASSWORD sets the server
password; the stored password and the variable are not changed
- Removing the variable, or an empty value, uses the stored password
- Connection URLs show the password in use; for a remote secret they
show the reference, not the secret
- Databases created before this release keep the v4.3.23 behavior