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act_runner v0.2.11 bundles an `act` that supports up to node20, but DeterminateSystems/nix-installer-action@main moved to the node24 runtime, so the job died with "runs.using ... got node24". Replace the JS action with a plain single-user Nix install (--no-daemon, no systemd needed in the catthehacker container) and set NIX_CONFIG at the job level so the bare `nix flake check` still gets flakes. A run step has no node-runtime coupling, so this won't break again when an action bumps its runtime. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>