Allow option `publicServerURL` to be set as async function

[mtrezza]

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New Feature / Enhancement Checklist

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Current Limitation

The option publicServerURL is static and can only be set once on server start. Since this is a public facing URL, it may be necessary in certain scenarios to update it, which currently requires a server restart.

Feature / Enhancement Description

Allow option publicServerURL to be set as an async function.

Example Use Case

• Domain failover

Alternatives / Workarounds

Restart server which has a resource impact.