update test.yml

Author: josheppinette

.github/workflows/test.yml

@@ -11,8 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - uses: DeterminateSystems/nix-installer-action@v21
-      - uses: DeterminateSystems/magic-nix-cache-action@v12
-      - run: nix profile install nixpkgs#direnv
+      - run: nix profile add .#direnv
       - run: |
           direnv allow
           direnv export gha >> "$GITHUB_ENV"