Use only cache.nixos.org in dependencies check

.github/workflows/build_test.yml

@@ -72,6 +72,10 @@ jobs:
             - uses: cachix/install-nix-action@v27
               with:
                 github_access_token: ${{ secrets.GITHUB_TOKEN }}
+            - uses: cachix/cachix-action@v15
+              with:
+                name: natsukagami
+                authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
             - name: Build dependencies
               run: nix build .#youmubot.cargoDeps --option substituters "https://cache.nixos.org" --option extra-substituters ""
     build:
@@ -87,5 +91,7 @@ jobs:
                 name: natsukagami
                 # If you chose API tokens for write access OR if you have a private cache
                 authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+            - name: Check cargoDeps
+              run: nix build .#youmubot.cargoDeps
             - name: Run nix build
               run: nix build

package.nix

@@ -1,4 +1,4 @@
-{ rustPlatform
+{ pkgs
 , lib
 , stdenv
 , pkg-config
@@ -11,7 +11,7 @@
 let
   customizeFeatures = !(enableCodeforces && enableOsu);
 in
-rustPlatform.buildRustPackage {
+pkgs.rustPlatform.buildRustPackage {
   pname = "youmubot";
   version = "0.1.0";