Can't create a Postgres database with .NET Aspire

Was trying to create a database (retmarkdb), but only datatabase "postgres" (with password 'retmark123') is created.

// RetmarkApp.AppHost/AppHost.cs

var builder = DistributedApplication.CreateBuilder(args);

// 1. PostgreSQL с фиксированным паролем 
var postgres = builder.AddPostgres("postgresdb")
    .WithEnvironment("POSTGRES_PASSWORD", "retmark123")
    .WithDataVolume()
    .WithPgAdmin(); 

// 2. Создаём базу автоматически через скрипт 
var databaseName = "retmarkdb";

var creationScript = $$"""
                       -- Create the database
                       CREATE DATABASE {{databaseName}};

                       """;
var db = postgres.AddDatabase(databaseName)
    .WithCreationScript(creationScript);

// 3. MongoDB
var mongo = builder.AddMongoDB("mongo")
    .WithDataVolume()
    .WithMongoExpress();

// 4. Ваш сервер
builder.AddProject<Projects.RetmarkApp_Server>("retmark-server")
    .WithReference(db)
    .WithReference(mongo)
    .WithExternalHttpEndpoints()
    .WaitFor(db);             

builder.Build().Run();