Running Debian build script results in deprecation warning

[bitsgalore]

Command:

./docker-package.sh debian:bullseye

Build works OK, but at the start of the build the following deprecation warning is shown:

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DEPRECATED: The legacy builder is deprecated and will be removed in a future release.
            Install the buildx component to build images with BuildKit:
            https://docs.docker.com/go/buildx/

Not entirely sure if this needs any action, and when. I already tried installing BuildKit myself, and managed to completely trash my Docker setup in the process.

Perhaps @carlwilson or @darrendignam could have a look at this at some point.