OptionalcacheSet for a service with a cache identity: VALKEY_URL is the login
cfx-db publishes for it.
OptionaldbAlso emit DATABASE_RO_URL, for a workload that routes read paths onto
the replica.
The literal Postgres role cfx-db declares for the workload, e.g.
swap_api_rw. A plain string, since that role is in another stack. Its
published login is what dbWorkloadEnv reads.
OptionalmaintenanceMAINTENANCE_SERVICE_ID, defaulting to cfx-<appName>. Pass false for
a function that is not independently maintenance-gated.
OptionalvalkeyValkey AUTH username, when it is not appName. A package that runs two
functions off one bundle gives each its own cache identity, e.g.
reward-events alongside reward-api.
Package name without the
cfx-prefix, e.g.swap-api.