Nothing invalidates the cache for me so its really quick to export, I've created another step where I split into two more containers, one for export and one for interactive docker to use. That's the workaround.

Now in my docker file I have two extra lines like this:

FROM scratch AS file_to_export
COPY --from=os_img /file/to/export /

Then I just have the docker builds with the necessary outputs needed:

# --output=type=docker   -> interactive use, mostly to be able to use "docker run" command
# --output=type=registry -> a place where the image can be cached so that we can load it
# --output=type=local,dest=output -> save the entire docker image/file from docker to disk

and of course I tag the images differently too, and I use os_img with the docker export and the new file_to_export as the local file output.

support multiple exporters for build #1555

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