Add Content-Type header to Form Webhook

[AndreasCaldewei]

Is your feature request related to a problem? Please describe.

Currently, there is no option to set headers on the Form Webhook. I need to set a Content-Type header on the request to properly integrate with a CRM.

webiny-js/packages/api-form-builder/src/plugins/triggers/webhook.ts

Lines 21 to 32 in 0581a6e

	const response = await fetch(url, {
	method: "POST",
	body: JSON.stringify({
	...data,
	meta: {
	submittedOn: format(new Date(meta.submittedOn), "yyyy-MM-dd HH:mm:ss"),
	// We don't spread the full `meta` object in order to ensure sensitive data
	// doesn't end up being included (at the moment, that's IP address).
	url: meta.url
	}
	})
	});

Describe the feature's behavior.

Two possible solutions are:

• Set a default Content-Type header to 'application/json'
• Make the headers customizable, allowing users to set their own headers, by passing trough an object like headers in the plugin.

Describe alternatives you've considered.

No response