Add machete to checks

.github/workflows/check.yml

@@ -25,7 +25,7 @@ jobs:
 
       - name: Setup rust
         run: |
-          cargo install sqlx-cli wasm-pack
+          cargo install sqlx-cli wasm-pack machete
           cd backend
           sqlx database create --database-url sqlite://db.sqlite3
           sqlx migrate run --source sync_server/src/app_state/database/migrations --database-url sqlite://db.sqlite3
@@ -40,6 +40,7 @@ jobs:
           cd backend
           cargo clippy --all-targets --all-features
           cargo fmt --all -- --check
+          cargo machete
 
       - name: Test backend
         run: |