Lifecycle Hooks + Notifications

STAGE: Next up 👉🏼

We're going to build out lifecycle hooks so you can wire up different parts of Nuon into your own systems.

pre-build/post-build hooks - run a command or ping a webhook URL when a build starts and stops (with the correct status)
pre-update/post-update - run a command or ping a webhook URL before or after an app installation is updated.
installation lifecycle hooks - ping a webhook url when an installation is created, deleted, fails a health check and more.

As always, we'd love to hear your feedback around how you'd like to use this functionality!