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Something seems to work better wrapping the creation of the `flask_image` in an apply statement:
```flask_image = gatheredDBOutput.apply(lambda args:
    docker.Image("flask-dockerimage",
        image_name=app_ecr_repo_repository_url,
        build=docker.DockerBuild(
            context="./frontend",
            args=dict(
                db_host_address = args[0],
                db_host_port = args[1],
                db_name = args[2],
                db_user = db_user,
                db_pwd = db_pwd
            )
        ),
        skip_push=False,
        registry=app_registry
    )
)```

I thought I saw a warning about creating resources within an `apply` statement since it’s a callback and funky things can happen when `pulumi preview` runs if this structure is used.