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hello, How could one use Pulumi to check if an ECR image should be build again? we are building images using the `awsx.classic.ecr.buildAndPushImage` function

Afaik you cannot. Mixins like this do all their work in the constructor, and it's non-optional. The only solution to this that I've found is to remove the image building logic from the main Pulumi app. You can have one small Pulumi app that runs `up` if (and only if) the image needs to change. And the main Pulumi app uses whatever image is currently pushed.

This fits the build-once-deploy-many-times mantra, too. A single app managing both the build and deploy cycles is prone to problems.

they are working on a new major version: <https://github.com/pulumi/pulumi-docker/issues/436>
that should be more like a normal resource and detect changes to the docker build context etc