feat: faster emulated builds - #37
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hash_inputs.sh stamps bread on hack/tar-shim.sh, but the images cache key left it out, so a tar-shim-only change restored stale tarballs.
qemu images publish untested, so waiting on build-and-test only delays them. push-ghcr and publish-release still wait on the gated native lanes.
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the s390x / ppc64le lanes took ~12-14 min, vs ~4 for native. almost all of that is apt/dpkg under qemu, which runs on 1 core.
make -j$(nproc) -O. the 5 version chains don't depend on each other, so they run in parallel across the runner's coresbinariesnow, so they overlap with build-and-test. push-ghcr / publish-release still wait on the native lanes, which are gated on testshack/tar-shim.shadded to the image cache key. it was missing, so a change to tar-shim alone would publish stale tarballs