Switch to Lix installer

Like typelevel/typelevel-nix#213

Author: rossabaker

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
       - uses: actions/[email protected]
 
       - name: "Install Nix️"
-        uses: cachix/install-nix-action@v30
+        uses: samueldr/lix-gha-installer-action@v1
 
       - name: "Install Cachix️"
         uses: cachix/cachix-action@v15