Laravel and Docker

I'm looking to host my Laravel application in an Azure App Service using a Docker container. I can route through to the welcome page but my application struggles to display the Filament Dashboard eg mysite.com/admin.

The login screen displayed ok but then I got some CSS issues. These were corrected by allowing CORS within the app service.

The APP_URL is set to https://mysite.com but I'm not sure if this is correct as it is with a docker container.

Any help or advice would be great.