https://learn.microsoft.com/en-us/dotnet/api/aspire.hosting.dockercomposeserviceextensions.asenvironmentplaceholder?view=dotnet-aspire-13.0
DockerComposeServiceExtensions.AsEnvironmentPlaceholder Method (Aspire.Hosting) | Microsoft Learn
Creates a placeholder for an environment variable in the Docker Compose file.
methodaspirehostingmicrosoftlearn