nix-build.yml

on:
  workflow_call:

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3

      - name: Install Nix
        uses: nixbuild/nix-quick-install-action@v31
        with:
          nix_conf: |
            keep-env-derivations = true
            keep-outputs = true

      - name: Restore and save Nix store
        uses: nix-community/cache-nix-action@v6
        with:
          # restore and save a cache using this key
          primary-key: nix-${{ runner.os }}-${{ hashFiles('**/*.nix', '**/flake.lock') }}
          # if there's no cache hit, restore a cache by this prefix
          restore-prefixes-first-match: nix-${{ runner.os }}-
          # collect garbage until the Nix store size (in bytes) is at most this number
          # before trying to save a new cache
          # 1G = 1073741824
          gc-max-store-size-linux: 1G
          # do purge caches
          purge: true
          # purge all versions of the cache
          purge-prefixes: nix-${{ runner.os }}-
          # created more than this number of seconds ago
          purge-created: 0
          # or, last accessed more than this number of seconds ago
          # relative to the start of the `Post Restore and save Nix store` phase
          purge-last-accessed: 0
          # except any version with the key that is the same as the `primary-key`
          purge-primary-key: never

      - name: Update inputs
        run: nix flake update

      - run: nix flake check -L --keep-going