Vertx HTTP: execute custom logic when HTTP server is started

[mkouba]

• resolves Provide a way to execute some logic when the HTTP server is started #42366

IMPL. NOTE: I chose CDI async events because it's "safer" compared to @Observes which always blocks the current thread. @ObservesAsync offloads the logic to the default blocking executor (worker thread in case of quarkus-vertx). I mean, we could mention this in the docs, even in javadoc, but that does not prevent users from executing "creative" code in those observers. @ObservesAsync should mitigate the risk a little ;-).

[geoand]

Very nice!

[quarkus-bot]

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[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 8e2e6e1.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

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[github-actions]

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