Update .github/workflows/main.yml

.github/workflows/main.yml

@@ -14,12 +14,14 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
-      - name: Install Nix
-        uses: cachix/install-nix-action@v16
-        with:
-          extra_nix_config: |
-            auto-optimise-store = true
-            experimental-features = nix-command flakes
+      - name: Install nix
+        run: |
+          sudo mkdir -p /nix /etc/nix
+          sudo chmod a+rwx /nix
+          sudo sh -c "echo 'sandbox = false' > /etc/nix/nix.conf"
+          sh <(curl -L https://nixos.org/nix/install) --no-daemon
+          mkdir -p /home/runner/.config/nix/
+          echo 'experimental-features = nix-command flakes' > /home/runner/.config/nix/nix.conf
       - name: Update flake.lock
         uses: DeterminateSystems/update-flake-lock@v16
         with: