change ci actions

Author: will

.github/workflows/ci.yml

@@ -14,12 +14,8 @@ jobs:
         os: [ubuntu-latest, macos-14]
     runs-on: ${{ matrix.os }}
     steps:
-      - name: Install Nix
-        uses: cachix/install-nix-action@v30
-      - uses: cachix/cachix-action@v15
-        with:
-          name: crunchy-public
-          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
       - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
       - name: nix flake check
         run:  nix flake check --print-build-logs --keep-going