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Fix 1940 - #1997
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Fix 1940#1997
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…tu-24.04-arm, not under QEMU The 10 ARM64 wheel builds ran on ubuntu-latest (x86_64) inside the target containers under QEMU user-mode emulation. In the last 5 completed runs (2026-10-18) a build took 37-40 minutes median and up to 96 minutes, and PyPy builds have segfaulted under emulation (exit 139), hence the 9 attempts of 120 minutes each (crossbario#1947). The build job now runs on ubuntu-24.04-arm, with the same container images, Dockerfiles and build script - the same switch as zlmdb crossbario#183. The tonistiigi/binfmt, setup-qemu-action and qemu-user-static steps are removed (the qemu-user-static image is x86_64 only). Buildx stays, it builds the custom PyPy images. A new first step fails if the runner is not aarch64. `--platform linux/arm64` stays and now only asserts the image architecture. The retry wrapper stays, with 60 minutes and 3 attempts as in zlmdb, until native runs have been measured. This replaces the A/B trial proposed in crossbario#1940: zlmdb's native jobs since crossbario#183 (16 runs, 2026-10-15..17, 288 ubuntu-24.04-arm jobs) were all successful, with a median pickup wait of 4 s (p95 288 s, max 595 s) and a median job duration of 1.7 minutes. Not changed here (follow-ups): the QEMU workarounds in the PyPy Dockerfiles (PYPY_DISABLE_JIT etc.) and in build-arm64-wheel.sh (nh3, py-ubjson), and native smoke tests of the built wheels (zlmdb crossbario#171). Harness change only, no red/green pair. Not verifiable locally: asgard1 is x86_64, and an emulated build would be QEMU again. The YAML parses; ruff check and just check-typing cpy314 pass. Expected CI result: GREEN - all 10 ARM64 builds green in a few minutes each with no retries, wheels and file names unchanged; main, wheels, wheels-docker and wstest stay green. Note: This work was completed with AI assistance (Claude Code).
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fixes #1940