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ci: distribute multi-platform bin-image build
closes https://github.com/docker/buildx/pull/3040
Switch to reusable workflow distributing multi-platform build across runners for bin-image job: https://github.com/crazy-max/.github?tab=readme-ov-file#bake-distribute-mp
Currently it takes almost 20min to build the bin image: https://github.com/docker/buildx/actions/runs/13401108061/job/37432288863
With this reusable workflow to distribute multi-platform builds it's ~3min
Putting this one back in draft as using git context makes the buildx version being wrong related to https://github.com/docker/buildx/pull/3155