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I'm not super familiar with awsx, but try awsx.ecs.FargateTaskDefinition instead of awsx.ecs.FargateServiceTaskDefinition
<https://www.pulumi.com/registry/packages/awsx/api-docs/ecs/fargatetaskdefinition/>

`containers` is an array:

```containers=[{
            "php": awsx.ecs.TaskDefinitionContainerDefinitionArgs(
                image=php_image.image_uri, cpu=512, memory=128, essential=True
            ),
            "nginx": awsx.ecs.TaskDefinitionContainerDefinitionArgs(
                image=nginx_image.image_uri, cpu=512, memory=128, essential=True
            ),
        }]```