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ci(nix): add Nix store caching to setup-nix action #268

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ryoppippi merged 2 commits into from
Jan 3, 2026
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ci(nix): add Nix store caching to setup-nix action #268

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ci(nix): add Nix store caching to setup-nix action
ryoppippi Jan 3, 2026
96bcc8e
ci(nix): replace cachix with cache-nix-action
ryoppippi Jan 3, 2026
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11 changes: 5 additions & 6 deletions .github/actions/setup-nix/action.yaml
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Original file line number Diff line number Diff line change
@@ -1,18 +1,17 @@
name: 'Setup Nix'
description: 'Install Nix and configure Cachix'
description: 'Install Nix and configure cache'
runs:
using: 'composite'
steps:
- name: Install Nix
uses: cachix/install-nix-action@0b0e072294b088b73964f1d72dfdac0951439dbd # v31.8.4
uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
with:
github_access_token: ${{ github.token }}

- name: Setup Cachix (numtide)
uses: cachix/cachix-action@0fc020193b5a1fa3ac4575aa3a7d3aa6a35435ad # v16
- name: Cache Nix store
uses: nix-community/cache-nix-action@b426b118b6dc86d6952988d396aa7c6b09776d08 # v7
with:
name: numtide
authToken: ''
primary-key: nix-${{ runner.os }}
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Copilot AI Jan 3, 2026

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The cache key should include a hash of the flake.lock file to ensure the cache is invalidated when Nix dependencies change. Currently, using only runner.os means the cache will persist even when flake.lock is updated, potentially causing builds to use outdated dependencies.

Consider changing the primary-key to include the flake.lock hash, for example:
primary-key: nix-${{ runner.os }}-${{ hashFiles('flake.lock') }}

Suggested change
primary-key: nix-${{ runner.os }}
primary-key: nix-${{ runner.os }}-${{ hashFiles('flake.lock') }}

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@cubic-dev-ai cubic-dev-ai bot Jan 3, 2026 •
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P2: Cache key should include a hash of flake.lock to ensure cache invalidation when dependencies change. Without this, the cache may serve stale dependencies after lock file updates.

Prompt for AI agents 
Check if this issue is valid — if so, understand the root cause and fix it. At .github/actions/setup-nix/action.yaml, line 14:

<comment>Cache key should include a hash of `flake.lock` to ensure cache invalidation when dependencies change. Without this, the cache may serve stale dependencies after lock file updates.</comment>

<file context>
@@ -8,6 +8,11 @@ runs:
+    - name: Cache Nix store
+      uses: nix-community/cache-nix-action@b426b118b6dc86d6952988d396aa7c6b09776d08 # v7
+      with:
+        primary-key: nix-${{ runner.os }}
+
     - name: Setup Cachix (numtide)
</file context>
Suggested change
primary-key: nix-${{ runner.os }}
primary-key: nix-${{ runner.os }}-${{ hashFiles('flake.lock') }}
Fix with Cubic


- name: Load Nix development environment
shell: bash
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