Run clippy in rust CI

rust/.github/workflows/build_nix.yml

@@ -1,7 +1,8 @@
+on: push
 name: "Build Nix package on Ubuntu"
 
-on:
-  push:
+env:
+  RUSTFLAGS: "-Dwarnings"
 
 jobs:
   build:
@@ -18,4 +19,11 @@ jobs:
       - uses: actions/upload-artifact@v3
         with:
           name: ${{ env.REPO_NAME }}-${{ env.COMMIT_HASH }}-x86_64-linux
-          path: result/bin/${{ env.REPO_NAME }}
+          path: result/bin/${{ env.REPO_NAME }}
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v23
+      - name: Lint
+        run: nix develop --command cargo clippy --all-targets --all-features