CORS issue running Shopware app at different domain than Shop

[stefpe]

If I run a Shopware Shop at https://test.com and an app at https://test-app.com I run into CORS issues triggering notifications from the app:

https://github.com/shopware/meteor/blob/main/packages/admin-sdk/src/channel.ts#L241

I saw you have a param called _origin in the sender function but its not possible to use it: https://github.com/shopware/meteor/blob/main/packages/admin-sdk/src/channel.ts#L111