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The --link flag is a feature of Docker BuildKit which tells Docker to treat the COPY'd layer independently of previous layers, enabling more aggressive build caching. For more details, see this Docker blog post [1]. When using COPY --link to copy files from a stage that does not contain /etc/passwd, we must --chown with $APP_USER_ID rather than app. Otherwise, the build would fail with "unknown user id". [1] https://www.docker.com/blog/image-rebase-and-improved-remote-cache-support-in-new-buildkit/