ci: add cache-nix-action for store-path caching across cold runs (#61)#151
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Amortise the non-niri half of the desktop closure (Quickshell, Qt6, matugen, DMS, xwayland-satellite, foot and transitive deps) that a fresh GH Actions runner otherwise rebuilds every cold run. Output-cache storage (actions/cache-shaped), orthogonal to the niri.cachix.org substituter trust lines (#59). Keyed on os × arch × flake.lock hash; PR branches restore from the os×arch prefix seeded on main. GC to 5G before save keeps both arch entries under the 10 GB per-repo limit; a 7-day last-accessed purge sweeps dead prefixes without evicting the run's own primary key. cache-nix-action chosen over Cachix/FlakeHub/Attic per the issue's trust-delegation reasoning; revisit only if hit rate stays below ~60% over a month or a second major source-built dep arrives. https://claude.ai/code/session_01R9nbBuTjy2rkiMYJ6NJ1G1
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What
Adds a
nix-community/cache-nix-action@v6step to.github/workflows/ci.yaml, betweencachix/install-nix-actionandnix flake check. Closes #61.It amortises the non-niri half of the desktop closure that a fresh GH Actions runner rebuilds on every cold run — Quickshell + Qt6 + matugen + DMS + xwayland-satellite + foot and their transitive deps. This is
actions/cache-shaped storage for build outputs, orthogonal to theniri.cachix.orgsubstituter trust lines added in #59 (those are a substituter; this is not).Key semantics
os × arch × hashFiles('flake.lock')— a lock bump invalidates cleanly.os×archprefix seeded onmain; the squash-auto-merge flow reseeds the cache after each PR lands.5Gbefore save so x86_64 + aarch64 entries coexist under the 10 GB per-repo limit.purge-primary-key: never).Why this and not Cachix/FlakeHub/Attic
Those are larger trust/operational delegations than a one-operator / three-host project warrants today. Per the issue's sequencing:
cache-nix-actionfirst; revisit Cachix/Attic only if hit rate stays below ~60% over a month or a second major source-built dep arrives.magic-nix-cache-actionis excluded (ambiguous post-EOL support status).Verification
purge-primary-key: neverpurge-safety all confirmed. Verdict: approve.actionlintruns as a flake-check pre-commit hook (parts/checks.nix), so CI lints this workflow as part of the gate.Acceptance criteria (#61)
cache-nix-action@v6step betweeninstall-nix-actionandnix flake checkrunner.arch+hashFiles('flake.lock')gc-max-store-size-linux: 5Gflake-check (x86_64-linux)/(aarch64-linux)untouched)https://claude.ai/code/session_01R9nbBuTjy2rkiMYJ6NJ1G1
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