ci: build multiarch images natively #214
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We currently build multiarch images using QEMU. This is slow. These days GitHub offers native arm64 builders for free for public repositories like ours, so let's use it. This is following [the recipe outlined on Docker's website][method], with a couple of adjustments to generate SBOMs and provenance attestations so that our images can be verified. [method]: https://docs.docker.com/build/ci/github-actions/multi-platform/#distribute-build-across-multiple-runners
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We currently build multiarch images using QEMU. This is slow. These days GitHub offers native arm64 builders for free for public repositories like ours, so let's use it.
This is following the recipe outlined on Docker's website. Kind of, with some modifications to support attestations and fix zizmor lints.