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This is Docker responsibility I think unless Pulumi is forcing a rebuild, perhaps you do a COPY ./ in the same directory you are make changes to your Pulumi. If docker build takes time then Pulumi will take time. If Docker build is smart enough to detect nothing has changed then I presume Pulumi will gain this benefit too

This means having the layers cached though if on a CI/CD box

ok I'though that Pulumi wouldn't contact Docker daemon at all if there were no changes to the sources

like, it seems that pulumi is "offloading" the responsiblity to perform the diff to the docker

it tries to push images although there were no changes