ci: fix test not working

.github/workflows/test.yml

@@ -15,7 +15,13 @@ jobs:
       contents: read
     steps:
       - uses: actions/checkout@v4
-      - uses: DeterminateSystems/nix-installer-action@main
+
+      - uses: cachix/install-nix-action@v30
+
+      - uses: cachix/cachix-action@v15
+        with:
+          name: devenv
+
       - uses: DeterminateSystems/magic-nix-cache-action@main
 
       - name: Install devenv.sh