Windows Server container support in App Service is now available in preview. Push your Windows container image to Docker Hub, Azure Container Registry, or a private registry, and deploy your containerized app to App Service. This feature enables a straightforward way to migrate .NET applications to Windows containers and run on Azure through a lift-and-shift straight to PaaS approach. Migration scenarios involving applications with dependencies or the need to include custom components in a multitenant environment would also benefit from the Window server container support. Now available in select regions in preview.
Source: Azure Roadmap