docker COPY without save point

I would like to COPY a really big file from the host filesystem to the guest

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  • but I want to use the file immediately in a shell script and throw it away, so that the save point is AFTER the script.

    However, it would appear that COPY creates a save point and anybody using my resulting image will have to download this large file. In my case, this results in about 5GB of needless data.

    Is there a way to copy a file from the local filesystem without invoking a save point?

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