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The aarch64 Docker images were built and tested under QEMU-user emulation, where the ASan-instrumented binary aborts at startup (CHECK failed: sanitizer_allocator_primary64.h) because QEMU's emulated address space cannot host libasan's fixed 64-bit allocator region. ASan was therefore disabled on arm64 via NO_SANITIZERS=2. Run the arm64 build/test on native ubuntu-24.04-arm runners instead of under QEMU, where ASan initialises normally, and drop arm64 from noasan_fallback_platforms so it builds with ASan again (ubuntu+debian). - publish_docker_matrix_base.yml: route linux/arm64/v8 to a native ubuntu-24.04-arm runner; skip the multiarch/qemu-user-static binfmt registration on that native runner (it is amd64-only and fails with "Exec format error" there, and is unneeded since arm64 containers run natively); lower vm.mmap_rnd_bits to 28 before the arm64 test as cheap CI-only insurance for older base-image libasan. - publish_docker_matrix_all.yml: remove linux/arm64/v8 from noasan_fallback_platforms (ubuntu, debian); narrow the AsanTest canaries to the platforms still under QEMU (armv7, ppc64le). - Makefile: drop the dead -DSANITIZER_CAN_USE_ALLOCATOR64=0 blocks (the define only affects libasan's own build, not the application) and document the real cause and fix.
…ative-runner Re-enable AddressSanitizer on aarch64 via native arm64 runners
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