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I personally wouldn't use Pulumi to build docker images unless you have a very good reason for that. I would use Pulumi to setup the infrastructure and *possibly* for deploying new versions which refer to the image registry

It depends on your setup if deploying should be within Pulumi or should it be done differently

Pulumi is not a CI tool and creating new images is the job for CI/CD

I would suggest you to use `docker.RegisteryImagewhich` which supports buildId <https://www.pulumi.com/registry/packages/docker/api-docs/registryimage/#buildid_nodejs>