ci: Blacksmith runners for Linux + Windows builds (~5x faster)#67
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Move the two slow CI builds to Blacksmith runners.
Result (measured on the branch)
macos-26. Blacksmith'smacos-26image lags the SDK (darwin 25.3.0 vs GitHub's 25.4.0) and fails to compiledom/webauthn(prfproperty absent). macOS already builds fastest, so no loss.Change
runs-on: ubuntu-24.04→blacksmith-16vcpu-ubuntu-2404(linux + windows)../mach build -j2→-j$(nproc). The-j2cap was a workaround for GitHub's 4-vCPU/16GB runner OOMing the link; a 16-vCPU/64GB Blacksmith runner doesn't need it.Follow-up (not in this PR): drop the now-pointless disk-reclaim + 16GB-swapfile steps, add
actions/cache@v5for the source tarball + cargo.Need help on this PR? Tag
/codesmithwith what you need. Autofix is disabled.