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I have some rather large images and building during preview really slows down preview and they build again during update. Locally it's not that big cause of caching, but it still takes extra needless time.

I think it is. You could wrap the code in `pulumi.isDryRun()`?

haha thx. that's what I did. Sadly then the preview shows Image `delete` as the diff. however I have noticed it doesn't actually delete. Just sucks explaining that it says delete but doesn't actually do anything to peers.

Feature-request time. I've checked the source code, there is no flag or combination of properties that skips the build. You can skip the push, but even if you cache the stages, the `dockerBuild` method of docker.js does eventually get called...