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ci: build each arch on native runners instead of QEMU - #6
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Split the single multi-platform buildx job into a matrix that builds linux/amd64 on ubuntu-latest and linux/arm64 on ubuntu-24.04-arm, then merges the two into one multi-arch manifest. The old job emulated arm64 via QEMU, so `npm install --omit=dev` had to compile better-sqlite3 from source on Alpine/musl under emulation. That took 30+ minutes on a cache miss and threw "qemu: uncaught target signal 4 (Illegal instruction)" during node-gyp, which risks publishing an arm64 image with a broken native binary. - per-arch GHA cache scopes so the two runners don't clobber each other - images pushed by digest, then stitched with `buildx imagetools create` so all existing tags (branch, pr, semver, latest) are unchanged - pull requests still build both arches for validation but push nothing, so the merge job is skipped
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Split the single multi-platform buildx job into a matrix that builds linux/amd64 on ubuntu-latest and linux/arm64 on ubuntu-24.04-arm, then merges the two into one multi-arch manifest.
The old job emulated arm64 via QEMU, so
npm install --omit=devhad to compile better-sqlite3 from source on Alpine/musl under emulation. That took 30+ minutes on a cache miss and threw"qemu: uncaught target signal 4 (Illegal instruction)" during node-gyp, which risks publishing an arm64 image with a broken native binary.
buildx imagetools createso all existing tags (branch, pr, semver, latest) are unchanged