When a new file is uploaded to a Minio Bucket, a webhook can be
configured to notify third parties about the event. Basically,
it's a POST call with a payload providing informations on the
event that just happened.
When a recording worker will stop, it will upload its data to a Minio
bucket, which will trigger the webhook.
Try to introduce the minimalest code to parse these events, discard
them whener it's relevant, and extract the recording ID, thus we
know which recording was successfully saved to the Minio bucket.
In the longer runner, it will trigger a callback.
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