Add a Gatsby Rebuild Button for Drupal

I have created a submodule to add the button. It pulls the site id from the gatsby.settings:incrementalbuild_url to trigger the correct Gatsby environment.

I've included 2 patches. One to be included using the composer.json patches option. The other is to be applied with git from the project root using `git am file.patch`.

The "Only trigger builds for published content" setting when turned off is designed to trigger builds for any entity type selected. There are some improvements to be made still on the firing of those events but otherwise, I think there are other modules that already have this capability to trigger a webhook and probably better served through that effort. Try this one: https://www.drupal.org/project/build_hooks →