In your github organization page, go to settings, for example: https://github.com/organizations/<YOUR_ORGANIZATION>/settings/profile. Then, go to Code, planning, and automation session, and click in Webhooks.
In Webhooks Page, click in Add Webhook button, in Payload URL, put the url of uploaded application (for do this step, you need already upped your pizzaiolo machine).
In Content type select application/json and in Secret put the same secret of you put in your GITHUB_WEBHOOK_SECRET env.
Select Send me everything in Which events would you like to trigger this webhook? session, and finally click in Add webhook.
If the active is not selected by default, select it.
After this your Github Webhooks is configured and you good to go, and can return to main documentation.