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Could you have updated your Docker provider from &lt;4 to &gt;=4? The image is now built only if the provider detects a relevant change. Previously, it was building every preview/up, which was annoying and slow.

RegistryImage and RemoteImage now have a _triggers_ property that you can use to force a rebuild. You could put, for example, a hash of a directory, or anything that changes when you want a rebuild to happen.

I see, thank you for letting me know. If it is easy to do, could you please send me a relevant change-log so I can look in closer detail? It is not obvious to me where I should be looking.

Where you should be looking for what? The changelog?

The changelog is here: <https://github.com/pulumi/pulumi-docker/releases>
The main decision thread is here: <https://github.com/pulumi/pulumi-docker/issues/436>
The tech details for this feature seem to start here: <https://github.com/pulumi/pulumi-docker/pull/446>