gistfile1.cs

                ContainerDefinitions = JsonSerializer.Serialize(new[] {
                        new Dictionary<string, object?> {
                            {"name", "first"},
                            {"image", "***.dkr.ecr.us-west-2.amazonaws.com/***:***"}, 
                            {"environment", new[] { new Dictionary<string, object> {
                                    {"PG_ENDPOINT", "potato"},
                                    {"PG_READ_ENDPOINT", "banana"},
                                    {"ASPNETCORE_URLS", "test"}
                                }}
                            },
                            {"cpu", 10},
                            {"memory", 512},
                            {"essential", true}, 
                            {"portMappings", new[] {new Dictionary<string, object?> {
                                        {"containerPort", 5000},
                                        {"hostPort", 80}
                                    }
                                }
                            }
                        }
                    }