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Previously every push to dev/** ran all 7 OS targets, and mac (the slowest) ran even for Linux-only script tweaks. Sibling jobs also couldn't cancel each other. Now setup runs classify-targets.sh, which diffs the branch against origin/master (three-dot so merging master in is a no-op for classification) and emits a JSON matrix of only the affected targets. ubuntu, mac, and the linux-container set fold into one matrix with fail-fast=true so any failure cancels the others. Per-OS script changes are detected by hashing each case "$os" arm in scripts/install-<recipe>.sh; shared (non-case) edits expand to all targets. Top-level files (justfile, init.sh, recipe.yml itself) also expand to all; mac-only files (flake.nix, nix/**) restrict to mac; os-init/<distro>-init.sh restricts to that distro. flatpak's mac entry is dropped unconditionally (the mac case is a no-op message). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
The previous standalone mac job set env.HOSTNAME=ci at job scope; the folded matrix needs it on the mac-specific step instead, otherwise nix-darwin can't resolve the host flake. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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