RFR: bot: add readiness handler

[Erik Joelsson]

On Wed, 12 May 2021 18:33:22 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review this patch that adds a "readiness" handler to the bot runner's HTTP server. A readiness handler can be used to automate deployments and are usually queried to see when a service is ready to do work. Typically listening on paths such a `/ready` the readiness can help automatic deployment software differentiate between the two states "started" and "ready to work". The "readiness" handler will return `200` when the bot runner is ready to work and `404` when it isn't.
> 
> Thanks,
> Erik

Marked as reviewed by erikj (Reviewer).

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PR: https://git.openjdk.java.net/skara/pull/1154