Allow hooks to be passed as YAML

[gparrello]

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Desired Behavior

Being able to pass hooks through YAML, as explained in the webhook README

Current Behavior

Hooks are hardcoded to be loaded from hooks.json

Alternatives Considered

Trying to override the -hooks argument with EXTRA_PARAM, no success

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[Roxedus]

-e EXTRA_PARAM="-hooks /config/hooks/hooks.yaml" works. while it does not override, it will also load the yaml hook. I'm not too interested in changing the default behavior, as making the json a empty list [] allows it to run.