Allow headers and POST requests for Post deployment Webhooks

[mattou07]

The Post deployment webhook is a useful feature in Cloud but its limited to only sending GET requests.

I am exploring the possibility of triggering a GitHub Action workflow via Webhook.

The use case is when Cloud makes an automated upgrade it could send a POST request webhook to GitHub to tell it to grab the latest git patch of the last deployment and create a PR.

This is apparently possible with repository_dispatch https://docs.github.com/en/actions/reference/events-that-trigger-workflows#repository_dispatch

This blog post mentions that the following headers are required to set this up: https://kontent.ai/blog/how-to-trigger-github-action-using-webhook-with-no-code/

"Accept": "application/vnd.github+json"
"Authorization": "token {personal token with repo access}"

The next added complication is differentiating between an automated upgrade and a deployment made by someone like myself. A filter of some kind may be needed to prevent loops.