chore: rely on cachix

.github/workflows/test-integration.yml

@@ -38,22 +38,6 @@ jobs:
           name: barretenberg
           authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
 
-      - name: Restore nix store cache
-        uses: actions/cache/restore@v3
-        id: cache
-        with:
-          path: ${{ env.CACHED_PATH }}
-          key: ${{ runner.os }}-flake-wasm-${{ hashFiles('*.lock') }}
-
-      # Based on https://github.com/marigold-dev/deku/blob/b5016f0cf4bf6ac48db9111b70dd7fb49b969dfd/.github/workflows/build.yml#L26
-      - name: Copy cache into nix store
-        if: steps.cache.outputs.cache-hit == 'true'
-        # We don't check the signature because we're the one that created the cache
-        run: |
-          for narinfo in ${{ env.CACHED_PATH }}/*.narinfo; do
-            path=$(head -n 1 "$narinfo" | awk '{print $2}')
-            nix copy --no-check-sigs --from "file://${{ env.CACHED_PATH }}" "$path"
-          done
 
       - name: Build noir_wasm package
         run: |