Replace actions/cache with cache-nix-action for nix store#32
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actions/cache@v4 on /nix/store was placed before nix installation and could not write to the daemon-owned store directory anyway. Replace with nix-community/cache-nix-action@v6 which understands nix store permissions, and move it after cachix/install-nix-action so /nix exists. Cache key now includes npins/sources.json, nix/*.nix and *.cabal hashes for proper invalidation. Prompt: apply the same fix to the haskell-template-project, update your ci-nix skill as well Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
actions/cache@v4on/nix/storewithnix-community/cache-nix-action@v6cachix/install-nix-actionso/nixexistsnpins/sources.json,nix/*.nix, and*.cabalhashesThe old
actions/cachewas placed before nix installation and could not write to the daemon-owned/nix/storeanyway — tar extraction produced thousands of permission errors silently.cache-nix-actionhandles nix store permissions correctly via sudo and SQLite database merging.Test plan
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