ci: update to determinate systems

Author: smoothprogrammer

.github/workflows/main.yaml

@@ -5,23 +5,18 @@ on:
   push:
     branches: [main]
 env:
-  CI_NIX_STORE: ~/nix
   CI_NIX_FLAKE: .#default
 jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - name: Setup Nix
-        uses: cachix/install-nix-action@v26
       - name: Checkout
         uses: actions/checkout@v4
+      - name: Setup Nix
+        uses: DeterminateSystems/nix-installer-action@main
       - name: Cache Nix
-        uses: actions/cache@v4
-        with:
-          path: ${{ env.CI_NIX_STORE }}
-          key: ${{ runner.os }}-nix-${{ hashFiles('flake.nix', 'flake.lock') }}
+        uses: DeterminateSystems/magic-nix-cache-action@main
       - name: Lint
         run: |
-          nix --store ${{ env.CI_NIX_STORE }} \
-            develop ${{ env.CI_NIX_FLAKE }} --command \
+          nix develop ${{ env.CI_NIX_FLAKE }} --command \
             editorconfig-checker && echo "ok"